Overview
This is not a camping gadget. It is a communication fallback when the phone becomes a camera with no bars.
Garmin says the inReach Mini 2 needs an active satellite subscription for the communication features that matter most here: SOS, messaging, check-in messages, tracking, location requests, weather, MapShare, and LiveTrack.
Without a subscription, it can still do limited device jobs like saving waypoints, activity recording, and navigation, but that is not the reason to carry one as safety gear.
It also needs a clear view of the sky to send messages and tracking points over the Iridium satellite network. Bottoms of canyons, dense cover, vehicle interiors, and bad antenna orientation can make communication slower or less reliable.
The setup matters before the trip: subscription active, Garmin Messenger or Explore synced, contacts and check-in messages loaded, a test message confirmed outdoors, and someone at home briefed on what each check-in means.
Safety gear only helps if it is charged, active, and already understood before the problem starts.