This is a very cool new device coming out soon from DeLorme:
They call it their inReach
In essence its very similar to the popular SPoT devices many explorers and hikers carry. What makes this device interesting is the added ability to send SMS/email messages to contacts, and to integrate with DeLorme software running on your android phone. You can use this to send track updates, assure loved ones that you’re safe, or even to summon help in an emergency and stay in communication with the inbound emergency services.
DeLorme is stating an MSRP of $250 and initial messaging plans starting at $9.95 a month which seems awfully reasonable for what you get.
MORE (from blog.delorme.com)