Garmin eTrex GPS - The eTrex is sort of a dumbed-down, rugged version of the company's more advanced eMap. Designed specifically for hiking, biking, and camping, the eTrex is one of the easiest-to-use GPS units available. It offers the ability to track up to 12 satellites so you never lose contact with one. The eTrex won't work inside--however, we don't anticipate that you'll get lost inside a building very often. Among the eTrex's notable features is its ability to calculate your current and average speed. We used the eTrex to determine the distance from work to home, and calculate how fast we were walking. This helped us gauge the average time it should take to get to work. This feature should really come in handy on extended hiking, camping, or cycling trips where planning your average speed and tracking the distance traveled is critical.