• High-sensitivity GPS receiver that gets better reception under canopy and in deep canyons
• Barometric altimeter provides improved elevation data
• Electronic compass allows you to find a bearing while you are standing still
• IPX7 waterproof case lets you work in the rain and drop it in a puddle
• Large, color TFT display for easy day and night viewing
• Built-in Americas autoroute basemap, which gives you the basic layout of the major roads in the area
• Built-In Waypoint averaging, which allows you to get a more accurate waypoint position
• Good Battery life and field replaceable, AA batteries.
• Ability to add an external antenna

These last three benefits are what i consider making this a very useful mapping gps. The ability to add a external antenna is very useful while driving, or for stashing you gps in your pack and still being able to track. This is great when used in conjuction with a digital camera, and being able to geotag the images. The waypoint averaging allows you to increase the positional accruacy by averaging thelocation instead of taking a one time reading as the waypoint location.