Delorme InReach SE coming this month, and looks like a very nice solution for boaters, off-trail explorers, foreign travel, etc. See: . It's an upgrade to the current InReach product.

I will be getting one of these as I like to explore backcountry areas solo on foot, mountain bike, and motorcycle...and it's nice to know you can share your location with friends and family, and send status messages or emergency help requests.

It's not cheap but if you have the need....

Nuvi 760 (died 6/2013); Forerunner 305 bike/run; Inreach SE; MotionX Drive (iPhone)