It's great for walking but on ANYTHING that moves you have to stop and concentrate to look at it.

For backwoods exploring (on trails) I plan to get a Lowrance unit, like they use in the Baja races... navigating while driving saves time, lots more fun too! Stopping and looking for 20-30 seconds is one thing, but to stop and scan and find your place on a TINY screen SUCKS!! Especially if you are going 10+ miles then you scan a huge area and can lose your spot easy, etc...