For those who don't know, an InReach is a satellite based two-way texting device that also has an SOS feature. You can communicate with the wives on shore, communicate with other boats when you don't want to broadcast information on an open VHF channel, get the weather, other features. It is subscription based (though I'm not sure if the SOS feature requires an active subscription). It uses rechargeable batteries that, depending on the device, last from as little as a few hours to as much as several days.