I recived this device from a friend who had no use for it. its great little gps, ive used for walkinga nd canoeing as its waterproof and found it very usful, the map that was provided on the 2gb sd card was no very detailed at all so i replaced it with a new map from http://www.openstreetmap.org/ which was very detailed and much more useful. i would strongly recomend replacing the map to any current user or buyer of this device. if your not going to do this then maybe you should by a device with a more detailed map already installed. great device, good accuracy, speed and elevation features.