I'm looking to do some downwinders away from the Metro area. What I'm looking for is some kind of GPS locating devise that send out a signal to my missus' phone (or a computer) in real time so she can track my progress and know when to come and pick me up (or where to pick me up in case things go tits up and I need to head to a random beach).
I've asked in the local camping, boating and 4WD shops but have not been to successful.

Does anyone have any ideas?

Cheers