Loufish
FRF Addict
...uh....thats 200 mph.....at that speed I agree about not being able to keep up...if you're moving at a football field per second kind of pace.
I just did my first Raptor run with the ROC and also my first time really using my Ipad mimi with Leadnav. The more I use my Leadnav the more I like it...my Ipad has the internal GPS chip and seem fast enough for what we were doing...
Whatever GPS you use make sure it imports .GPX files that are a standardized file for many (but not all) GPS units.