So let's see:
- DeLorme inReach can send and receive messages with any SMS or email address anywhere in the world
- goTenna can send and receive messages only with another goTenna-linked phone via two-watts on MURS within a range of . . . well, take your pick:
"Under normal circumstances, expect to be within a mile or two of someone instead."
"[...] around 1 mile in skyscraper-filled urban areas, but up to 9 miles in most outdoor situations like hiking and camping. If you're climbing or, say, out skiing, it shoots from 9 miles to as high as 50 miles once you start ascending to higher elevations."
"GoTenna says its devices will transmit up to three miles in the woods or eight miles over open water."
"Perdomo says in a city the low-frequency radio waves reach about a mile, but in an open field it can reach about 50 miles."
"For example, at the top of a mountain, a GoTenna could find devices up to 50 miles away. But when in the center of a forest, it might only be able to reach three to four miles away."