I've been using my Tom Tom Rider for training walks just for the trip statistics. The problem is, it has a internal battery and only lasts a few hours. Plus it has started acting wierd lately.

All I want is a GPS that measures average speed while moving and distance traveled. I don't need navigation capabilities. It also has to use AA or AAA batteries as I'm planning a long day walk that will outlast any internal batteries.

I know the Forerunner watch will do this, but it seems kind of expensive.

Thoughts?