Become one with the basecamp software. It really is very good. That is if yer buying a Garmin. You prolly are. If you want to guide yerself on the TWAT, being able to load tracks on to the GPS will likely be important to you. All answers are in the making tracks forum. Have fun, despite early misgivings about them, I have found that GPS devices, when properly used and understood, really can maximise the fun of a ride.