Yesterday I saw this on sparkfuns homepage, part. I instantly thought about how great this would be in uav's. My first thought would be for drone recovery. but the options are limitless.
You have to buy this, then take it apart. Then the subscription pricing is $99.99 for the basic package which allows you to send unlimited messages of your gps location with one of 14 predifined messages.
For an addition fee ($50 for 500) you can send a custom message of up to 41 characters.
Anyway just thought i'd share.