The short version
A messenger talks; a beacon shouts once, very loudly. A satellite messenger sends and receives text messages, shares your track, and can trigger an SOS with two-way communication, all on a monthly subscription. A personal locator beacon has one function, no subscription, a long shelf life and a very robust dedicated distress channel. If you want to tell someone you are running late, buy the messenger. If you want the most reliable single call for help, buy the beacon.
Common questions
Does either work without cell coverage?
Yes, that is the point of both. They use satellites, not cell towers. Both need a reasonable view of the sky, so a deep canyon or dense canopy can delay a signal.
Do I need to register a beacon?
Yes. A personal locator beacon must be registered with the national authority for your country, and an unregistered activation slows the response because nobody knows who you are or what you were doing. Registration is free and takes minutes.
Is a phone enough?
In many races and on many trails, no. Coverage in mountain terrain is unreliable and a phone battery in the cold does not last. A phone is a good first option and a poor only option if you are going somewhere remote alone.
At a glance
| Garmin inReach Mini 2 | ACR ResQLink 400 PLB | |
|---|---|---|
| Two-way messaging | Yes | No |
| Subscription required | Yes | No |
| Track sharing with family | Yes | No |
| Battery | Rechargeable, days of use | Sealed, years of standby |
| Rescue channel | Commercial coordination centre | Government search and rescue network |
| Registration required | Account | Yes, with the national authority |
Choose the Garmin inReach Mini 2 if…
You run and train alone regularly and you want the ability to say something other than help. Being able to message that you are fine but four hours behind prevents a search rather than triggering one, and the tracking page means someone at home can see where you are. The subscription is the real cost, and it runs whether you use it or not.
Check Garmin inReach Mini 2 on Amazon
Choose the ACR ResQLink 400 PLB if…
You want a device that sits in a pack for five years and works. A beacon has no subscription, an extremely long battery shelf life, and transmits on the dedicated international distress frequency. It cannot tell you help is coming, it cannot be cancelled by text, and it does exactly one thing extremely reliably.
Check ACR ResQLink 400 PLB on Amazon
Full reviews of each device
For the detail on specific units, including subscription costs and the things each one cannot do, see our Garmin inReach Mini 2 review, the larger inReach Messenger Plus review, and the subscription-free ACR ResQLink 400 beacon review.
Related
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these products side by side. Confirm current specifications and prices before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.