Ham Tracker
"Ham Tracker allows Radio Amateurs on the move to send location updates to APRS-IS (the Internet side of APRS) from their mobile device. Once sent, your position can be tracked using services such as aprs.fi. Don't worry though, you're in control of your privacy and can turn off the sending of position reports at any time.
"Ham Tracker makes it easy to send an email containing an aprs.fi tracking link for your callsign or a map link showing your current location. Use these to tell colleagues, friends and family where you are, letting them track your progress using a web browser without them needing to phone to ask.
"Ham Tracker doesn't even need to be running in the foreground on your device. You can simply install it, configure it, then forget it. The application will run quietly in the background, notice when your location changes significantly (in practice that's when your phone switches to a different cell on the mobile network), wake up, start sending position reports at regular intervals, notice when you've not moved much for a while, then go back to sleep. This approach only uses the device's GPS receiver when you're actually moving, so keeping battery use to a minimum."
http://itunes.apple.com/gb/app/ham-tracker/
id406552499?mt=8
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