Choosing a Satellite Messenger or PLB: Two-Way or One-Way, Activating One in Taiwan, Plus 6 Current Models From inReach, ZOLEO and ResQLink

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At Longdong you usually have phone signal. Below a cliff on a mid-elevation peak, down in a river gorge, or on a Dolomites north face, you might have none at all. That's what satellite messengers and personal locator beacons (PLBs) are for: they skip the cell towers and send a distress signal and coordinates straight to a satellite, which relays it to rescuers. A two-way messenger also lets you text back and forth with the rescue centre and tell them who's hurt, how badly, and whether you have warm gear.

This post answers three things only: which type to buy, which model, and whether you can legally use it in Taiwan and abroad. For splitting jobs at an accident scene and choosing between 119 and 112, see Crag First Aid and Accident Response; for getting yourself out on the rope, see Self-Rescue Basics; for general preparation on multi-pitch and alpine routes, see Multi-Pitch Basics and What Is Alpine Climbing. By the end you should be able to decide between a two-way messenger, a PLB or both, pick a model, and know what to sort out before activating it or flying abroad.

Three categories: two-way messengers, PLBs, phone satellite SOS

A primer from a Colorado rescue team (Colorado SAR, updated 2023-12) explains the difference between the two dedicated devices clearly. A PLB transmits at roughly three times the power of a satellite messenger, so it's better at pushing through dense tree cover. But tight gullies, heavy canopy and bad weather can block either one, which is why some people carry both.

Ocean Signal, a PLB maker, also says in its FAQ that alongside an iPhone, "When practical, carry both" (Ocean Signal). Parks Canada's mountain search-and-rescue page is blunter: satellite phones and beacons are useful but "cannot be relied upon absolutely". You still need to be able to self-rescue, and to keep yourself and your partner going through the wait (Parks Canada).

Something to do tonight: open your phone's settings and check whether it has satellite SOS. If it does, remember that it won't appear in Taiwan.

Six criteria

1. Two-way or one-way: once someone is hurt, you need to talk

When a PLB goes off, rescuers only know that someone at these coordinates needs help. A two-way messenger can answer what they most want to know: how many people, who's hurt, where, and whether they're conscious. Garmin's SOS FAQ says staff will first message your device to find out what's going on, while contacting your listed emergency contacts for medical history, party size and itinerary (Garmin FAQ).

Two-way messaging also covers the last stretch. Adventure Otaku quotes a former Coast Guard rescue pilot: a helicopter flying right over someone without seeing them does happen, and with an inReach you can send "you just flew over me" (Adventure Otaku, 2025).

The PLB's advantages are on the other side: no subscription, nothing to lapse if you forget to renew, and a direct line into the government search-and-rescue system.

Something to do tonight: imagine your partner breaks a leg on pitch three. Write down the three things you'd need rescuers to know, then check whether your current gear could send them.

2. Network: deep valleys and trees make a big difference

Right under a wall, in a gorge or on a north face, the sky shrinks to a slot. Backpacking Light timed delivery in 170 side-by-side tests (BPL, test table updated 2024-11):

The gap comes from the network. BPL explains that Globalstar satellites have no links between them and can only relay a message when one is in direct line of sight with a ground station, so in the mountains they "commonly experienced message delays of several minutes" and far more failures than Iridium devices. Iridium is a low-orbit constellation with satellites passing in turn; inReach and ZOLEO both use it.

Phones have it harder. Apple says it "might take 30 seconds or more" in ideal conditions and up to several minutes under trees, and that foliage, hills, canyons and tall structures can block the connection (Apple). Pixel uses satellites in fixed geostationary positions, and Google tells you to turn and tilt the phone to point at one (Google). In the northern hemisphere those satellites sit in the southern sky, so I'd guess north faces and north-facing gorges are especially bad for a Pixel. When Outdoor Life tested iPhone satellite messaging in a deep canyon in 2024, the message took 70 minutes to arrive and the phone gave no sign of the delay (Outdoor Life); that was the messaging feature, not SOS.

Dedicated devices aren't magic either: in a narrow canyon, HikingGuy couldn't get either phone or an inReach Mini 2 to send anything (video below). If you can move to open ground, move first. There's no published test from directly under a vertical wall or in a chimney; deep-valley numbers are the closest reference.

Something to do tonight: think of a route you climb often with high walls on both sides. Mark the nearest open spot (a ridge, a belay ledge, the valley mouth); that's where you'd send from.

3. Battery and cold: rescues are measured in days

In three recent Taiwanese inReach rescues it took 14–20 hours from alert to reaching the casualty (see the case table below). When Meg in the Forest pressed SOS for a friend in the Wind River Range, her inReach Mini ran flat twice while they waited (Meg in the Forest, 2025). During an SOS, tracking is forced on and the power button stops working, which drains the battery fast. Bring a power bank.

On cold: most of these devices are rated to operate down to −20 °C.

Charging is what to watch. Garmin says it charges only slowly below freezing; ZOLEO won't charge below freezing at all.

In practice, Treeline carried a Mini 3 Plus on the outside of a pack all winter skiing and hiking and wrote, "Cold did not slow down the unit's ability to function and battery drain was minimal" (Treeline Review, 2026).

A PLB battery is single-use and not user-replaceable; when it expires, or after one activation, it goes back to the manufacturer (intervals in the model table below).

Something to do tonight: put your power bank and the messenger's charging cable in the same pouch so they leave the house together.

4. Subscriptions: what to do in the off months

Garmin's FAQ says "Select Garmin devices maintain SOS capability even when service is suspended" but doesn't list which ones, so ask before you buy (Garmin FAQ). ZOLEO's plans page says that while suspended "you cannot send messages, check-ins, or SOS alerts" (ZOLEO).

HikingGuy worked out the cost over one PLB battery life using US prices: a discounted inReach Mini 2 plus activation, with the cheapest plan turned on for one month a year, comes out slightly cheaper than a rescueME PLB1 (HikingGuy, 2026). That's US pricing; Taiwan plans cost differently.

Something to do tonight: circle the months in a year when you actually go somewhere without signal. If it's only two or three, price out suspension plus the cheapest plan.

5. Where to carry it: two schools of thought

Neither manufacturers nor guides have written down how to carry one while climbing; there are just two sets of reasons:

• Inside the pack: Alpine Savvy wrote in 2022 that every guide and SAR professional he asked keeps it inside the pack or maybe in a pocket, "never on the backpack strap", because outside it gets ripped off or smashed (Alpine Savvy).
• On your body: in a fall you might lose the pack with it. The LA Times reported on a solo climber who fell in the Sierra and "lost her backpack" but still sent an SOS with her inReach; the article doesn't say where she carried it (LA Times, 2025).

Antenna orientation matters too. Garmin's manual says to point the antenna at the sky; the Mini 3 Plus has an exposed helix antenna, while the Messenger Plus has a larger patch antenna that's more forgiving of angle (Justin Outdoors, 2026).

In the pack, you may not be able to reach it after a fall. So on multi-pitch, this post suggests keeping it in a pocket on your body, or on a short cord with a locking carabiner on a rear gear loop of your harness. That follows from "you must still reach it after a fall"; we found no written advice from a manufacturer or guide.

The other common failure is not bringing it. The AAC's 2024 accident report includes Ines Papert's 2023 accident in British Columbia: she'd forgotten her Garmin, was rescued after her partner sent an SOS from an iPhone via satellite, and said afterwards, "I was kicking myself for not bringing an inReach" (AAC, 2024).

Something to do tonight: clip the messenger where you normally carry it and run the "pack falls off" scenario in your head. Is it still on you?

6. Can you use it where you're going?

Taiwan, Italy, Japan and Korea all have different rules, and in some countries a PLB can't be used on land at all. The next two sections cover them separately.

In Taiwan: legality, activation, registration

inReach: Chunghwa Telecom ID check plus a Garmin subscription

The inReach is sold legally in Taiwan; Chunghwa Telecom's page lists the NCC approval number for the Mini 2 (Chunghwa Telecom). Activation has two steps:

1. Take two forms of ID to Chunghwa Telecom for real-name verification and get a satellite service registration code. Chunghwa says this is because telecom services must enforce real-name registration by law, and this basic service is free.
2. Enter the code in Garmin Explore and pick a plan (Garmin Taiwan plans).

Chunghwa also says Iridium in Taiwan cannot provide voice calls because of legal restrictions, only text messaging on the SBD platform.

Garmin Taiwan currently sells the Mini 3 at NT$14,990 (Garmin Taiwan). Its NCC number isn't printed on the Taiwanese product page or the Chinese manual. To check it yourself, search the NCC type approval database by the model number A04998, or ask Garmin Taiwan support.

Garmin Taiwan's own tutorial walks through activation and SOS. From 8:40 it covers SOS: after you press it there's a countdown during which any button cancels, and the alert goes to the IERCC, which is staffed around the clock. It also points out that without an active subscription the home screen shows "not activated" and messaging, tracking and SOS all stop working. It's the manufacturer's channel, so treat it as a Chinese-language how-to only.

Buying abroad, or subscribing through a foreign account

The regulations say something here, but the NCC hasn't published an interpretation, so all we can do is quote the regulations.

• Article 9(1)(6) of the Regulations Governing the Manufacture, Import and Declaration of Controlled Telecommunications Radio-Frequency Devices is the exemption route for personal-use devices, but it explicitly excludes "mobile satellite earth stations".
• Article 16 of the same regulations: foreign visitors bringing in a mobile satellite earth station for personal use don't need an import permit, limited to one unit.
• Whether a handheld Iridium or Globalstar messenger counts as a "mobile satellite earth station", what a Taiwanese resident bringing one home should do, and whether using a foreign subscription that skips Chunghwa's real-name check is illegal: the NCC hasn't said publicly. The only way to be sure is to write to the NCC.
• ZOLEO and SPOT have no distributor in Taiwan.

Garmin Taiwan's plans page itself warns that some jurisdictions regulate or prohibit satellite communication devices, and that users are responsible for knowing and following the local law.

PLB: the 416 country code and Maritime and Port Bureau registration

PLBs are allowed in Taiwan on land, at sea and in the air (COSPAS-SARSAT national regulations), but there are two steps. Article 29 of the same regulations requires owners to register with the Ministry of Transportation's Maritime and Port Bureau, and the bureau's 2025 PLB registration rules say (Executive Yuan Gazette):

持有者購買PLB時須先向廠商確認該PLB已燒錄416國碼，可於國內辦理PLB登錄；非416國碼者，應請廠商重新燒錄。

In English: when buying a PLB, check with the seller that it's been programmed with country code 416 so it can be registered in Taiwan; if it carries another code, have the seller reprogram it. So a US or UK unit bought online needs to be recoded first. Registration is on the bureau's beacon registration platform, and the bureau submits it to the international beacon database (IBRD) within seven working days.

Activated in Taiwan, the signal is received by the Taipei Mission Control Centre (TAMCC), which is located at the Civil Aeronautics Administration; the Maritime and Port Bureau says its operation "will be contracted" to the Chinese Search and Rescue Association, without saying whether that has happened yet (Maritime and Port Bureau); once it's confirmed not to be a false alert, SAR units are notified. Activated abroad, the nearest mission control centre receives it and TAMCC gets it too. If you set it off by accident, call 02-2701-3400 immediately to cancel.

Phone satellite SOS: Taiwan isn't on the list

Taiwan isn't on Apple's list of countries for Emergency SOS via satellite (Apple Taiwan), and it isn't on Pixel's either. Taiwanese carriers have only signed memoranda so far, such as Taiwan Mobile's March 2026 agreement with AST SpaceMobile (Taiwan Mobile); nothing is live.

After an inReach SOS in Taiwan, who gets the alert

Chunghwa Telecom says the IERCC immediately notifies the domestic rescue agency: the National Fire Agency on land, the Coast Guard Administration at sea. A National Fire Agency post from April 2025 gives more detail: its command centre received the alert from Garmin's IERCC, first contacted the ground contact the user had registered, then notified the National Airborne Service Corps and Taichung's fire department (National Fire Agency, Threads). There are also cases where the alert landed at one county's fire department first and was then passed to the right jurisdiction.

Public cases since 2024:

The last row is worth a second look: nobody pressed SOS. Tracking plus someone at home watching it brought them back.

Abroad: the Dolomites and the Alps, Japan, Korea

Italy (the Dolomites)

• Call 112 first. CAI explains that 112 goes to a single answering centre, which routes medical calls to 118 and mountain calls on to Soccorso Alpino, and "la chiamata è gratuita e può essere effettuata anche qualora il telefono non abbia una SIM": it's free and works without a SIM (CAI Lo Scarpone, 2025). CAI also notes that 112 hasn't reached every region yet; where it hasn't, call 118 for medical emergencies.
• iPhone satellite SOS works in Italy. An iPhone bought in Taiwan can use it there; the exclusion list is only a handful of countries such as Armenia, Belarus and mainland China (Apple). Apple's relay centre supports Italian and Japanese but not Chinese, so use English. Pixel works in Italy too.
• Satellite SOS or 112? European authorities don't say directly which to use first. This post's suggestion: if there's signal, call 112 first, because voice goes straight to local dispatch; only press satellite SOS when there's no signal, since the message goes through the Garmin Response centre before reaching local rescuers. Apple's own guidance is also "First, try calling the local emergency number".
• GeoResQ. A rescue app run by the Italian mountain rescue service CNSAS and promoted by CAI; it needs mobile data. Sources conflict on cost: CAI wrote in 2023 that it's now free for everyone (CAI), while CNSAS's English page still says it's a paid service with 50% off for CAI members (CNSAS).
• SOS EU ALP. DAV says this app covers Bavaria, Austria and South Tyrol (DAV, 2025). Part of the Dolomites is in South Tyrol (Bolzano province) while Cortina is in Veneto, so which app works depends on which province you're in.
• PLBs are allowed in Italy. COSPAS-SARSAT's national-regulations page lists Italy as allowed on land, sea and air. The Italian station's Q&A says beacons "must be registered with the Italian Satellite Station Cospas-Sarsat in Bari", in the context of Italian-coded beacons; it doesn't say whether visitors' beacons need anything extra (Cospas-Sarsat Italy).
• Rescue costs. Veneto charges people injured on rock or ice routes even if they're hospitalised; details in the Italy Climbing Crags Overview. Before a north face like Tre Cime, check that your insurance covers mountain rescue.

Switzerland and Austria

• Rega's current FAQ says you can store alarm@rega.ch in your inReach; messages to it include your position and Rega can reply directly. But this only works in Switzerland and near its border; abroad, use the SOS button (Rega). So it's no use in the Dolomites.
• In Austria and Switzerland, land PLB alerts are passed to the police, and the COSPAS-SARSAT national regulations page says "Appropriate SAR action cannot be guaranteed"; a phone or satellite phone is more suitable.
• A Rega helicopter mission costs around 4,500 Swiss francs on average, normally paid by the person rescued or their insurer (Rega). Mountain rescue in Lower Austria and Vienna charges €612 an hour for a standard team from 2026, even if a helicopter ends up doing the rescue (Bergrettung NÖ/W).

Japan

• No PLBs on land. The COSPAS-SARSAT regulations page says of Japan: "Land activations are prohibited and subject to penalty by radio law". For Japanese crags, leave the PLB at home.
• iPhone satellite SOS works in Japan; Pixel doesn't.
• For an inReach SOS in Japan, according to a Yamareco video, the Garmin centre confirms details with you in English or Japanese and passes it to the Japanese police once it decides a rescue is needed (video below).

Korea

• PLBs aren't allowed on land, at sea or in the air.
• Korea isn't on either the iPhone or Pixel satellite SOS list.
• That leaves two-way messengers. Garmin's manual warns that some places regulate satellite communication devices, so check local rules before heading to Korean crags.

Something to do tonight: write down the countries on your next trip, check them against the three items above (PLB, phone satellite SOS, local emergency number), and save the numbers that apply in your phone.

Six current models

Only models the manufacturer was still selling on 2026-11-01. Prices are the manufacturer's list prices that day, in the manufacturer's currency.

Details worth knowing:

• Weights don't agree. Garmin lists the Mini 3 Plus at 125.2 g; Treeline's roundup says "3.5 ounces" (about 99 g) and Treeline's own single review says 4.5 oz. For the rescueME PLB1, the US product page and the manual differ by 1 g.
• The Mini 3 Plus once couldn't send for hours. DC Rainmaker's December 2025 in-depth review describes a long hike during which the Mini 3 Plus couldn't send satellite messages for hours, while the Mini 2 he was also carrying worked; only a restart fixed it (DC Rainmaker). Garmin told him the cause: when paired with a phone that has no internet, the device might not fall back to satellite. Garmin's firmware changelog lists v5.03 (2026-02-10) as "Fixed possible issue where messages could fail to send" (Garmin); the timing and description match, but Garmin hasn't said it's the same issue. Update the firmware before you go, and if a message sits unsent for a long time, restart.
• Chinese messages are much shorter than the spec suggests. According to the Yamareco video, non-Plus models cap a message at 160 bytes, which is exactly 160 characters in English; a Chinese or Japanese character takes 3 bytes, leaving about 53. Garmin's "160 characters" means English characters. Plus models have ten times the limit.
• Reviewers disagree. Backpacker names the Messenger Plus its overall favourite and the Mini 3 Plus best standalone device (Backpacker). Switchback names the Mini 3 Plus best overall and ZOLEO best budget, but also says of the Mini 3 Plus that "long-term durability in harsh conditions is still an open question" (Switchback Travel). In BPL's tests the Messenger Plus never failed under trees or in deep valleys (see criterion 2).
• Treeline's PLB section lists both the ResQLink 400 and the rescueME PLB1, but labels the latter as an ACR product; it's actually Ocean Signal (Treeline Review).

Also-rans and what we left out

• SPOT X and SPOT Gen4 (Globalstar): the SPOT X is two-way at US$249.99; the Gen4 is one-way at US$149.99. In BPL's tests the SPOT X took about 15 minutes on average in deep valleys; when Outdoor Life tested the Gen4 in canyons, both messages were delayed about 10 minutes. Climbing terrain is bad for Globalstar, so we don't recommend them. On the SPOT X coverage map Taiwan is the same colour as Japan and Korea, but the map doesn't say what the colours mean, and there's no distributor in Taiwan.
• ACR ResQLink View: US$469.95, adds a numeric display and runs 28 hours; otherwise like the 400.
• rescueME PLB3: adds AIS and return-link confirmation, but it's designed for life jackets; climbers don't need it.
• Motorola Defy Satellite Link, left out: its maker Bullitt went under in January 2024 and it's no longer sold.

Phone satellite SOS: not a model, but know its limits

• It doesn't work in Taiwan (see above). It does in Italy and Japan.
• You have to aim it, and gorges and trees slow it down. See criterion 2 and the Chase the Summit and HikingGuy videos below.
• Sources conflict. The AAC report on Papert's accident says iPhone satellite SOS didn't allow direct dialogue with SAR, only a single 40-character message to one emergency contact; that doesn't match Apple's description of texting back and forth with emergency services.
• T-Mobile T-Satellite (Starlink direct-to-phone) sends in 5–10 seconds under open sky in the US (Backpacker's test). Inside the US you can sign up even if you're not a T-Mobile customer; abroad you need a qualifying T-Mobile plan and US residence, and T-Mobile's international roaming page lists the US, Canada, New Zealand and Japan; not Taiwan or Europe (T-Mobile). After months of use, HikingGuy still carries an inReach on the cheapest plan just for SOS (HikingGuy, 2026).
• In Japan, au Starlink Direct, Nagano prefectural police and Yamareco ran a joint trial; Yamareco's 2025 video explains the process, but it's only a trial for now (Yamareco, 2025).

Test and review videos

Only videos from 2024 onward that cover specific models or real rescues; start times are checked against the subtitles. HikingGuy.com has tested almost every model, so where possible we pair him with other channels. Climbing channels haven't covered these devices in the past couple of years, and there's no dedicated video on how to carry one while climbing.

Model reviews

In-depth review of the Mini 3 and Mini 3 Plus. From 9:22 DC Rainmaker covers SOS: the button sits under a hard plastic cover and you lift it and hold to trigger; he thinks the Essential or Standard plan is enough. From 18:55 he covers the sending failure mentioned above: for the first three hours of an eight-hour hike, until a forced restart fixed it. The description says he bought the Mini 3 Plus and borrowed the base model, with Amazon affiliate links.

Six months on. From 6:28 HikingGuy covers battery: power-saving mode with 10-minute tracking gets him 130–300 hours, short of Garmin's 350, mostly depending on tree cover. From 12:00 he explains why he still carries a dedicated device despite phone satellite: rescues often take hours or days, phone batteries last hours, an inReach lasts days. The description says "Tested & Not Sponsored", with affiliate links.

Mini 3 Plus or Messenger Plus. Justin Outdoors tested both in the Canadian Rockies. From 3:02, battery: with no tracking, the Mini 3 Plus lasts about 4 days in performance mode and the Messenger Plus about 7. From 6:14, antennas: the Mini 3 Plus's exposed helix wants to point at the sky, while the Messenger Plus's patch antenna sends and receives faster from inside a pack or tent. He'd pick the Messenger Plus unless he wasn't carrying a phone. The description has affiliate links.

The new ZOLEO. From 2:48 HikingGuy explains that two-way messaging depends entirely on the phone app; the device itself has only SOS, a check-in button and LEDs. From 5:31, subscriptions: SOS needs one too, with a three-month minimum. From 6:37, battery: ZOLEO claims 200+ hours and he gets about 190, dropping to about 80 with 12-minute location sharing. The description says "Not Sponsored", with REI affiliate links.

Phones versus dedicated devices in canyons and trees

The most useful video on this topic. HikingGuy compares a Pixel 9, an iPhone and an inReach Mini 2 in a San Diego canyon. From 5:16, at the canyon mouth with high walls on both sides, the Pixel 9 gets through and the iPhone has him moving around hunting for a satellite. From 6:44, in the narrow canyon, neither phone sends SOS without a GPS fix, and the Mini 2 fails to send after about 10 minutes. The description says "Not Sponsored", with affiliate links.

iPhone and inReach under tall trees. From 7:24 Chase the Summit tests under tall forest: the iPhone tells him to turn around for a better satellite partway through, takes about 3–4 minutes to send, and sends the message twice. From 12:01, the inReach Messenger needs no aiming and delivers in about 20–25 seconds. The description includes an FTC affiliate disclosure.

Actually pressing SOS

A rescue in the Wind River Range. From 0:17 Meg in the Forest describes pressing SOS for a friend on an off-trail rocky pass in the Wind Rivers. From 0:36 she shows how: lift the cover, hold about 4 seconds, loud beeping and a 20-second countdown, then your position goes out automatically; during the SOS tracking is forced on and the power button stops working. From 2:37, her experience: messages to Garmin Response went through faster than any others, and weren't charged. The first helicopter couldn't land, and the rescue took 20 hours in the end. In her follow-up video on the same rescue she adds that Garmin only shares progress with registered emergency contacts, and she says her husband couldn't get updates because he wasn't registered (later in the same video she calls him their emergency contact, so the account is inconsistent); check your contacts and medical notes before every trip (from 4:21). The description says she takes no sponsorship, with affiliate links.

PLB or satellite messenger

Is a PLB still worth it now that suspended inReach keeps SOS? From 0:52 HikingGuy covers Garmin's change: SOS still works while suspended. From 1:10 he works out seven-year costs at US prices. From 4:06, the PLB's advantages: higher transmit power, better through tree canopy, and a direct link into government SAR. The description says "Not Sponsored", with affiliate links.

A PLB owner's second thoughts. Adventure Otaku bought his ACR ResQLink in 2022. From 1:18, the upside: no subscription, just register it and check the battery date. From 5:10, the downsides: rescuers don't know what's happened, and battery replacement means sending it to the maker or an authorised centre. From 7:15 is the "helicopter flew right over" story mentioned earlier. No sponsorship is disclosed, though the description has affiliate links (including the ACR ResQLink).

In Japanese

Chinese and Japanese message length, and how rescue works in Japan. From 5:06 the Yamareco president's channel explains that 160 bytes is 160 characters in English, but Japanese and Chinese characters take 3 bytes each, leaving about 53. From 19:39: after SOS, Garmin's centre confirms details in English or Japanese and passes it to the Japanese police once a rescue is needed. From 23:29 he says an accidental SOS that has already triggered a response could be billed up to US$340 an hour. In the subtitles he says it isn't Garmin-sponsored; note that Yamareco runs its own hiking app.

The only Chinese-language video is Garmin Taiwan's own tutorial (embedded above); there are no 2024-or-later field tests from Taiwanese climbers.

After you press SOS

What happens

For Garmin inReach (Garmin FAQ, Mini 3 manual):

1. Lift the SOS cover and hold; when the countdown ends it sends automatically. It works even with the device off, as long as there's battery.
2. It sends your position every minute for the first 10 minutes, then every 10 minutes.
3. Garmin Response messages your device to ask what's happening and contacts your emergency contacts.
4. The centre notifies the most appropriate local rescue agency. Help comes even if you don't reply: "Rescuers will be dispatched even if they cannot reach you via your device".

Garmin's 2025 SOS report says it received more than 3,000 SOS incidents that year, and in more than 12% users ended up self-rescuing (Garmin press release). In his video on Garmin's 2023 report, HikingGuy also says that if you're unsure whether to press it, you can press it and talk it through with Garmin Response by message (HikingGuy, 2024).

Questions to have answers ready for

Garmin asks about the situation, medical history, party size and itinerary; Parks Canada dispatchers ask for sex, age, name, location and injuries. Have these ready:

• Who's hurt, where, and are they conscious
• How many people in total, and how the others are
• Exact location: route name, which pitch, at a belay or hanging on the rope
• Whether you have warm gear

Accidental activation and cancelling

• Garmin: hold the SOS button → Cancel SOS → confirm, and wait for the confirmation message. Once you cancel, Garmin Response can no longer communicate with your device. Garmin's US handheld FAQ gives a 20-second countdown and the Norwegian (nb-NO) page says 30; go by your own device.
• Don't test with SOS. Garmin says "Never trigger an SOS to test your device. Unapproved testing may result in unnecessary dispatch and financial penalties". Book a test in advance instead.
• rescueME PLB1: it doesn't actually transmit until about 50 seconds after activation, and you can cancel in that window. If you set it off by accident, call local emergency services and give them the 15-digit HEX ID, your location and when it was activated; the manual also warns that deliberate misuse or accidental activation may lead to prosecution and a fine (PLB1 manual). It also says to place the PLB flat on the ground if possible, antenna upright.
• PLB registered in Taiwan: call the Taipei Mission Control Centre on 02-2701-3400.

Who pays for the rescue

Garmin doesn't charge for contacting Garmin Response, but "you are financially responsible for any rescue or aid fees", and its rescue insurance is only sold in the US (including its territories) and Canada.

Only six Taiwanese local governments have rescue-cost provisions: Taichung, Nantou, Hualien, Miaoli, Pingtung and Kaohsiung, all enacted in 2016–2018 and never amended. They apply when you have an accident in a designated restricted mountain area and the local government runs the search; they bill actual costs, including aircraft, capped at the emergency-rescue cover of your mountaineering insurance (Taichung's minimum required cover is NT$300,000 or NT$500,000 depending on the route), but with no cap if you broke the rules, for example by not getting a permit (Taichung Mountaineering Activities Management Ordinance). Kaohsiung only bills rule-breakers (Kaohsiung Mountain Accident Rescue Management Ordinance). New Taipei (where Longdong is), Yilan, Taitung, Hsinchu County, Taoyuan and others have no such ordinance.

For costs abroad, see the Italy, Switzerland and Austria sections above.

Choosing by situation

Longdong and Taiwanese single-pitch crags

You'll usually have signal, so follow Crag First Aid and Accident Response and call 119 or 112. Whether to add a messenger depends on whether you go places with unreliable signal. In 2022 the NCC said mobile coverage in the mountains can't be complete (NCC, 2022-02), and urged hikers to carry a PLB or satellite phone as well as a mobile (NCC, 2022-04).

Taiwan's high mountains, gorges and mid-elevation peaks

• First choice is the inReach Mini 3 activated through Chunghwa Telecom: legal in Taiwan, with Chinese instructions, and alerts go to the National Fire Agency.
• If you only go occasionally, rent first. The National Fire Agency has supported three organisations that rent out satellite devices and run trip-contact platforms (NFA); Mabu Valley's subsidised inReach costs NT$50 a day, minimum three days, with a NT$3,600 deposit (Mabu Valley).
• Turn on tracking and have someone at home watching. Both August 2026 cases, on Nanhu and Qilai, were found through tracking plus a trip contact. The National Police Agency's mountain-entry permit system also recommends carrying a satellite locator such as an inReach (NPA mountain entry system).
• For a backup that doesn't depend on a subscription, add a PLB, and remember the 416 code and registration.

The Dolomites and the Alps

• Save 112 and call it first if you have signal.
• With an iPhone 14 or later, satellite SOS works in Italy, but expect it to be slow on north faces and in deep valleys.
• An inReach is still the mainstay. The longer messages on a Mini 3 Plus or Messenger Plus are more useful when explaining your situation to rescuers abroad.
• A PLB works in Italy, but in Austria and Switzerland it only goes to the police.
• Check before you leave that your insurance covers mountain rescue.

Japan and Korea

• Don't bring a PLB.
• Japan: iPhone satellite SOS works, and inReach has Japanese-language support.
• Korea: no phone satellite SOS, which leaves two-way messengers; check local rules first.

Inspection and care

• The night before: charge fully and pack the power bank and cable. For a PLB, check the battery expiry (ACR 5 years, PLB1 7 years); after one activation it goes back to the maker.
• Subscription and firmware: turn it on and make sure the home screen doesn't say "not activated"; update the firmware, especially on a Mini 3 Plus.
• Emergency contacts and medical notes: check before every trip; Garmin only updates registered contacts.
• PLB registration: ACR says beacon registration is valid for 2 years; renew it when it expires.
• Water rating: the Mini 3 series is IP67 and ZOLEO IP68, the Messenger Plus only IPX7, and the PLB1 is waterproof to 15 m.
• Charging in the cold: below 0 °C Garmin charges slowly and ZOLEO won't charge.
• Don't test with SOS: Garmin requires you to book a test in advance.

For inspecting and retiring the rest of your climbing gear, see Inspecting, Caring For and Retiring Climbing Gear.

Practice: four scenarios

Answers are under each question; think first, then look.

1. You bought a US-market ACR ResQLink 400 online and plan to take it on a mid-elevation peak in Taiwan.

2. You're on pitch five of a Dolomites north face and your partner falls and is injured. Your phone has one bar, and you're carrying an inReach.

3. In a gorge you send an "I'm OK" message from your inReach, and 30 minutes later the app still says sending.

4. Next month you're climbing for a week each in Japan and Korea, and you own an inReach and a registered PLB.

Next

A satellite messenger handles talking to people outside your party. For talking to your partner when it's windy and you can't see each other, see the next post: Part 13: Climbing Radios.

References

Manufacturer product pages and prices (checked 2026-11-01) are linked in the table above.

• PLBs and Satellite Messaging Devices: A Primer (Colorado SAR, updated 2023-12-28)
• How SOS Coverage and Emergency Response Works (Garmin)
• inReach Mini 3 Owner's Manual (Garmin)
• Update and Learn More About the Software on Your inReach Mini 3 (Garmin)
• Garmin releases annual inReach SOS report (Garmin press release, 2026-02)
• inReach plans (Garmin Taiwan)
• ZOLEO Plans
• rescueME PLB1 User Manual (Ocean Signal, 912S-01260)
• Gear Guide: Satellite Messaging Devices (Backpacking Light, 2025-12-02; test table updated 2024-11-15)
• Testing the iPhone Satellite Messenger (Outdoor Life, 2024-10-30)
• Garmin inReach Mini 3 & 3 Plus In-Depth Review (DC Rainmaker, 2025-12-22)
• Garmin inReach Mini 3 Plus Review (Treeline Review, 2026)
• Best Satellite Messengers and Personal Locator Beacons (Treeline Review, 2026)
• Best Satellite Communicators (Backpacker, updated 2026-08-18)
• Best Satellite Messengers of 2026 (Switchback Travel, 2026-09-29)
• Use Emergency SOS via satellite on your iPhone (Apple 105097)
• Emergency SOS via satellite availability (Apple 101573)
• Satellite SOS on Pixel (Google)
• Where do you carry your satcom device? (Alpine Savvy, 2022-10-14)
• After climber survives gruesome injury in Sierras, it takes five helicopters to rescue her (LA Times, 2025-07-08)
• Chinese Puzzle Wall accident report (AAC, 2024)
• Mountain parks search and rescue (Parks Canada)
• National Beacon Regulations for the Use of PLBs (COSPAS-SARSAT)
• Questions and answers (Cospas-Sarsat Italy)
• International roaming plans (T-Mobile)
• Garmin inReach sign-up (Chunghwa Telecom, in Chinese)
• Regulations Governing the Manufacture, Import and Declaration of Controlled Telecommunications Radio-Frequency Devices (Laws & Regulations Database, in Chinese)
• PLB registration rules (Maritime and Port Bureau, 2025-10-09, Executive Yuan Gazette, in Chinese)
• Beacon registration platform (Maritime and Port Bureau, in Chinese)
• Future outlook: navigation safety (Maritime and Port Bureau, in Chinese)
• Taiwan Mobile and AST SpaceMobile sign LEO satellite MOU (Taiwan Mobile, 2026-03-02, in Chinese)
• Jiuxian Shan inReach rescue (National Fire Agency on Threads, 2025-04-08, in Chinese)
• Anpingkeng forest road rescue (Yilan County Fire Bureau, 2024-03-20, in Chinese)
• Lisi Creek rescue (Hsinchu County Fire Bureau repost, 2025-06, in Chinese)
• Pintian Shan cliff rescue (Hsinchu County Government, 2026-01-08, in Chinese)
• Nanhu and Qilai north face missing-climber cases (United Daily News, 2026-08-04, in Chinese)
• Taichung Mountaineering Activities Management Ordinance (in Chinese)
• Kaohsiung Mountain Accident Rescue Management Ordinance (in Chinese)
• NCC improving mobile coverage in mountain areas (NCC, 2022-02-02, in Chinese)
• NCC urges hikers to carry a PLB or satellite phone (NCC, 2022-04-01, in Chinese)
• Summer hiking: rent a satellite locator (National Fire Agency, 2024-08-03, in Chinese)
• Garmin inReach rental (Mabu Valley, in Chinese)
• Mountain entry permit system notices (National Police Agency, in Chinese)
• Chiamate di emergenza: quando e come attivare i soccorsi in montagna (CAI Lo Scarpone, 2025-08-26)
• GeoResQ diventa gratuita per tutti (CAI, 2023-07-10)
• GeoResQ (CNSAS)
• Notruf und Rettung in den Alpen (DAV, 2025-07-06)
• Emergency numbers (Rega)
• Questions and answers on patronage (Rega)
• Mission billing 2026 (Bergrettung Lower Austria/Vienna)
• Garmin inReach Mini 3 & 3 Plus In-Depth Review (DC Rainmaker, 2026-02-02)
• Garmin inReach Mini 3 Plus: 6 Months Later (HikingGuy.com, 2026-08-14)
• Battle of the SOS Devices (Justin Outdoors, 2026-10-02)
• inReach Rival? The New ZOLEO, Trail Tested (HikingGuy.com, 2026-09-16)
• Pixel 9 Satellite SOS vs iPhone vs inReach (HikingGuy.com, 2024-08-26)
• Real Life Test: Apple Satellite Messaging vs Garmin InReach! (Chase the Summit, 2024-08-29)
• T-Satellite Is Amazing! (HikingGuy.com, 2026-04-04)
• What Happens When You Push the SOS Button on Your Garmin InReach Mini (Meg in the Forest, 2025-10-06)
• I hit the Garmin InReach SOS Button and here's what I learned (Meg in the Forest, 2025-09-16)
• When to Hit SOS on Your inReach, According to Garmin (HikingGuy.com, 2024-02-29)
• Garmin inReach: Did This SOS Update Kill the PLB? (HikingGuy.com, 2026-06-09)
• PLB vs Inreach - Did I make a mistake? (Adventure Otaku, 2025-09-21)
• Garmin inReach explained (Yamareco, 2024-11-19, in Japanese)
• Satellite SOS field trial (Yamareco, 2025-05-30, in Japanese)
• inReach Mini 3 tutorial (Garmin Taiwan, 2026-01-14, in Chinese)