Originally Posted by
contango
It's also handy if I'm cycling a significant distance to visit someone I can let them track my progress with something like Latitude.
Latitude gives an approximate location.
Real Time GPS Tracker let's someone else know EXACTLY where you are, along with how fast you're moving and how much battery you have remaining. My wife keeps an eye on my rides. If I'm stopped for more than a few minutes she texts me to make sure I'm ok.