Originally Posted by
znomit
With a 500 you can use the virtual partner feature for mapping a course.
You can also save your current course and follow it to find you way home (or out of a river bed when you take a wrong turn on the trails).
^This too. The Edge has a ton of great features beyond just recording metrics like speed, hr, cadence & elevation.
I'm actually kind of surprised that more people don't utilize them.