this unit be a great handheld gp . very rugged . the best feature be the software 's ability to interface with google earth on the computer , and the optional bird eye satellite imaging you can download to the GPS unit -lrb- available from garmin for about 30 buck -rrb- a year . the removable micro sd card allow you to setup and store different map and waypoint for different area on different card . look forward to try out the geocach feature this weekend ! I give it a 4 star review because the product description provide by the Amazon and Garmin website to make a informed decision on which GPS unit would suit my need be mislead . the unit come equip with `` build in base map '' that do not show one road or geographical datum within 10 mile of my home . no information on the base map except freeway and highway . do not include any surface street in my area , so buyer beware . the way i choose to get accurate road and trail information be by purchase the garmin topo map for a additional fee . this map include surface street and some trail information . it do include dirt road . these map only cover certain geographical area , like southern , north eastern and western state . the map be very detailed , include information on my local off road vehicle area . you may have to purchase more than one map set depend on where you be plan to go . the memory card that come with the unit -lrb- 1 gig -rrb- will not hold all the map datum from the topo map I purchase , you either must select smaller area where you will be travel and download to the gp or purchase a larger datum card . I would purchase this unit again !