The Best Personal Locator Beacon and Satellite Messenger Review

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The contenders in the Personal Locator Beacon review.
Credit: Matt Gerdes
We took some of the best and most popular emergency electronic devices and used them side-by-side for six months. Our mission: to find out what is the best for telling your family and friends you are okay and what the is best for sending out an SOS signal. We tested one PLB (Personal Locator Beach) and four SEND (Satellite Emergency Notification Devices). Read on to see which emergency devices we rated as best to carry on your next adventure.

Read the full review below >

Review by: and Matt Gerdes

Top Ranked Personal Locator Beacons

Displaying 1 - 5 of 5 << Previous | View All | Next >>
Our Ranking #1 #2 #3 #4 #5
Product Name
DeLorme InReach SE Satellite Messenger
DeLorme InReach SE Satellite Messenger
Read the Review
DeLorme InReach Explorer
DeLorme InReach Explorer
Read the Review
ACR ResQlink 406 Personal Locator Beacon
ACR ResQlink 406 Personal Locator Beacon
Read the Review
Video video review
SPOT 3 Satellite Messenger
SPOT 3 Satellite Messenger
Read the Review
Apple iPhone Find My Friends
Apple iPhone Find My Friends
Read the Review
Editors' Awards  Editors' Choice Award      Best Buy Award   
Street Price Varies $278 - $300
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Varies $378 - $380
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Varies $280 - $287
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$150
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$Free with iPhone
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Pros Easy one-handed (and gloved, if not mittened) SOS operation. Two-way messaging is awesome. Smartphone interface works well. Pairs automatically on startup. Overall very intuitive and easy to use.Easy one-handed (and gloved, if not mittened) SOS operation. Two-way messaging is awesome. Smartphone interface works well. Pairs automatically on startup. Overall very intuitive and easy to use.Five-watt transmission power, dual frequency SOS transmission, COSPAS/SARSAT’s reliability and long track record, no annual fees., easy one handed (even gloved) operation.Compact and lightweight ergonomic design, improvement over Spot 2, good value.It’s free. Good way to keep an eye on your girlfriend or boyfriend (or kids)… or their phone, anyway.
Cons Expensive. Clunky ergonomics and design. Largest of the devices we tested. Not as effective as a PLB in life-threatening situations.Expensive. Clunky ergonomics and design. Largest of the devices we testedUnless the lack of messaging is a con for you, we found no faults with this device.No two-way communication, no smartphone interface, low 0.4 watt transmission power, Globalstar satellite constellation is arguably less effective than Iridium or COSPAS/SARSAT.It only works when your phone is on and has an excellent data signal, it does not connect you with emergency services, and is useless as an SOS device.
Best Uses Any activity or expedition during which satellite messaging and tracking is useful or crucial; absolutely needs clear view to the sky in order to function properly. Water resistant.Any activity or expedition during which satellite messaging and tracking is useful or crucial; absolutely needs clear view to the sky in order to function properly. Water resistant.Any activity or expedition during which an SOS broadcast needs best chance of being answered, functions best with clear view to sky.Any activity or expedition during which simple pre-defined satellite message sending or tracking would be fun. Absolutely needs clear view of the sky to function properly. Water resistant.
Date Reviewed Jul 09, 2015Jul 13, 2015Feb 02, 2015Aug 02, 2014Jan 21, 2013
Weighted Scores DeLorme InReach SE Satellite Messenger DeLorme InReach Explorer ACR ResQlink 406 Personal Locator Beacon SPOT 3 Satellite Messenger Apple iPhone Find My Friends
SOS - 30%
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Reception - 20%
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Sending Messages - 10%
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Ease Of Use - 15%
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Product Specs DeLorme InReach SE Satellite Messenger DeLorme InReach Explorer ACR ResQlink 406 Personal Locator Beacon SPOT 3 Satellite Messenger Apple iPhone Find My Friends
Dimensions (in./cm) 4.8 x 2.8 x 1.7 inches, 12 x 7 x 4.3 cm 2.4" x 1" x 5.9" (7 cm x 2.5 cm x 8.1 cm) 3.9 x 1.9 x 1.3 inches, 9.9 x 4.8 x 3.3 cm 3.4 x 2.6 x 1 inches, 8.7 x 6.5 x 2.5 cm N/A (size of an iphone)
Weight w/ batts oz/g 8.18oz / 232g 7oz / 198g 4.6oz / 130g 4.0oz/ 114g N/A (weight of an iphone)
Battery Life (hours) 100 hrs (lithium batteries) 100 hours (lithium polymer battery) 5 year lifecycle (30hrs on SOS) 150 hrs (lithium batteries) N/A (battery life of an iphone)
Waterproof Rating IP67 (1 meter) IP67 (withstands incidental water exposure; tested for submersion at one meter for 30 minutes) Rated to 95-100% humidity None
Pair with smartphone? Yes Yes No No Yes
Minimum Annual Subscription (US dollars) 120 145 0 (but 5 year battery costs 150 to replace) 150 0
Ideal Annual Subscription (includes tracking and some messages if applicable) 300 (or 160 for 4 months) for unlimited tracking and predefined messages, 40 custom text messages /month 300 for unlimited tracking and 40 custom text messages /month $0 150 $0
Satellite Network Iridium 100% global coverage via the Iridium satellite network, which is the world's furthest-reaching satellite communications network COMSAT Globalstar None
Transmission power 1.6 watts 2,450 mAh capacity at 3.7 V 5 watts N/A
2-way messaging yes yes no no yes

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OutdoorGearLab Editors' Hands-on Review



Over the past few years we don't know how many times we've heard someone say what a good idea it would be to "get a SPOT." Launched in 2007, the ad campaign for the original SPOT introduced many outdoor sports enthusiasts to the concept of emergency satellite messaging devices. But more than eight years later there still remains a lack of understanding of how these devices work. When we began researching them for our own use, we were struck by the variety of options available and especially by how truly different each of them are, even though they are widely viewed as all fitting into the same category of device.

Before reading further, we encourage you to read our How to Choose a Personal Locator Beacon or Satellite Messenger which explains the different satellite networks and how they interact with the devices we tested and our How to Best Use Your Activity Tracker and Handheld GPS Article to see how you can get the most out of your device.

We start by asking and answering three key questions:

Will it successfully transmit an SOS when you most need it to? What if you are unconscious?


For SOS functionality, the long track record and dual transmission power together with the COSPAS/SARSAT satellite network make the ACR ResQLink the clear winner, and virtually any PLB will perform better in this capacity than the SEND devices we tested here.

However, there is a possible theoretical advantage for devices which offer tracking (SPOT 3 and Connect, and InReach SE). In the case of our lead tester, if he's going wingsuit BASE jumping or paragliding, he can initiate tracking before his launch. In the event of a crash in which he loses consciousness, there is still a chance that he can be found without having to actually press the SOS button. However, there are two major caveats here:
  1. If he crashes in dense trees or in a canyon and ends up lying on his device it very likely will not work (based on our testing, and many reports from friends and user reviews). They are serious when they say "Give clear view to sky" in the manual of each device. Even a small amount of backpack material or light forest coverage can prevent a successful GPS coordinate lock.
  1. In this case, someone else has to immediately recognize that you're in trouble and then get the coordinates from your shared map page and organize the rescue. This will likely take time, but it may make body recoveries easier.

Is it easy to use? Can anyone pick it up and use it if needed?


Out of all of the devices, the ACR has the clearest and simplest instructions for initiating an SOS. The SPOT 3 comes in second place here for simplicity, but the InReach has the most thorough instruction label on the device. The Spot Connect Satellite Messenger has no instructions on the device (you would have to print instructions and keep them with the device).

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Screen shot of locating someone using the DeLorme InReach. The message bubbles are when we sent a location when we got to camp. The connected dots are when the tracking feature is turned on.
Credit: DeLorme / Chris McNamara

What are your priorities? Messaging, rescue only, tracking?


If messaging is the most important feature for you, the InReach SE or InReach Explorer is by far the winner and beats the SPOT Connect by a large margin. If you want the ability to send one simple pre-defined check-in message which isn't of crucial importance anyway (a significant percentage of the SPOT 3 messages I sent, failed), then the SPOT 3 is a contender. For tracking, all three of the above devices functioned reasonably well with the InReach slightly ahead. And finally, if you really just want the best SOS functionality, then the ResQLink is the device to choose.

In summary, the InReach SE bills itself as a "2-way satellite communicator" and it lives up to its title. You can indeed communicate via satellites and it also, on the side, has as SOS feature.

The SPOT devices are advertised as "satellite messengers" and in the case of the Connect, a "satellite communicator" (one-way only, that is). Fair enough, you can get some messages out to your contacts, sometimes.

Experience in the field: Spot 3 vs. InReach SE


We used the Spot side-by-side with the InReach throughout the test, recording the time needed for standalone messages to be received by contacts and confirmed as sent. The InReach messages were received faster than the Spot messages about 60 percent of the time, with the InReach messages either confirmed as failed or received within 20 minutes almost every time. The Spot messages at times confirmed as failed only 45 minutes after the send attempt, and were sometimes received more than two hours after the initial send. Testing these two devices side-by-side in standalone mode is the "apples to apples" test, but it's only fair to mention that the InReach, when paired with a smartphone, allows the user to watch the progress of the message send on the phone with a clear visual confirmation of it being sent successfully or not. This is a lot nicer than trying to decipher the blinking lights on the Spot, wondering if the message was sent or not. Since the chief feature of the Spot is its ability to send messages to your contacts, and the InReach performs message sending so much better, the InReach is quite clearly a superior device for this purpose.

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Example of the InReach messaging when paired with a smart phone.
Credit: Chris McNamara

A popular anecdote illustrating a drawback of any satellite messenger device which performs with less than 100 percent consistency is that if your contacts are expecting to receive "okay" messages from you, then not receiving them is almost a guaranteed source of stress. If your family or significant other is expecting to receive "okay" messages at a certain frequency, and then they do not, it could cause them to raise the alarm unnecessarily. Indeed, there are many reported cases of this documented by rescue services, and many stories of a messaging device causing, instead of alleviating, stress for people who are tracking the progress of the user.

If you are using a device to reassure your contacts that you are okay on an hourly/daily basis, then be sure that everyone fully understands the limitations of the device and establish a clear understanding of what it could mean if the messages are not received.

Comparing Plans


It used to be the Spot had a much less expensive data plan. However, inReach now has a Freedom plan that does not require an annual subscription (SPOT requires a 12 month commitment). For people who only do a few trips a year out of cell service, you save money with the inReach plans, even with unlimited texting at the $65 level. Over a few years, it could actually be month cheaper to own the inReach despite it costing $300 compared to the SPOT's $150 price tag. It all depends which service plan you choose so everyone situation is different.

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inreach service plan
Credit: DeLorme
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Spot 3 service plan
Credit: Spot

See the Spot Service Plans
See the inReach Service Plans

The Bottom Line


Editors' Choice - Best for Messaging and Tracking


The DeLorme InReach SE Satellite Messenger is by far the best for sending and receiving messages. It costs a lot, but we found it is well worth it. If there are concerned people who want to track you, this device is by far the most reliable. It's also the only device that reliably lets you communicate two ways. If you want the ability to track your route on your device, pay another $80 and get the Inreach Explorer. We never used this feature and therefor prefer to save $80.
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Credit: DeLorme

Best Buy


The SPOT 3 Satellite Messenger does not have nearly the functionality or performance of the InReach, but it's also less than half the cost. That said, you don't necessarily save money on the data plan as explained above. If you main priority is to just let people track you, send an occasional "okay" message and possible use SOS, then the SPOT 3 generally gets the job done less expensively than the inReach SE. It's also half the size.
Credit: Spot

Chris McNamara and Matt Gerdes
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