Globalstar (Spot) also uses a revolving LEO constellation. The advantage to a GEO is that initiating a call may be easier and it won't drop due to a handover. But that's the only advantage for a mobile handset. The path distance dictates the need for a larger antenna and higher power, low angle, higher latency (delay) make it less attractive.The InReach devices use the Iridium satelllite constellation, which are multiple satellites in low Earth orbit, and thus do not require 'line of sight' to the single fixed point in the sky that the Inmarsat system does. Therefore, InReach (and Iridium satellite phones) should work in more places than Inmarsat.