There's a software bug in the InReach Mini that prevents the device from acquiring a satellite fix after moving a significant distance (>1500 miles) in an easterly direction while powered off.
Iridium messaging and SOS features still work (and the device passes the InReach "test") but you will need another position source if you need rescue.
A "reset" through the system menu does not restore functionality, but a full hard reset (OK, back, and down while switched off) will recover GPS. You can remain roughly in the same area, and also travel an unlimited* distance west without experiencing further problems.
Obviously you'll need to reactivate (no computer needed) and re-sync your contacts and routes.
I've been able to reproduce this on several occasions - I travel between Europe and North and South America on a weekly basis.
Incidentally - it's a fairly gaping error in the test implementation that it can present a pass without GPS position. Sure, it's only testing the Iridium bit, but it's a last-line rescue tool and the test should mean "ready to go in all respects".
*well, less than 180 degrees of longitude obviously... 
