Summary: The device is very accurate. The topo usa map that was sold by Magellan for this device could use some improvement. The maps are off for some areas by 300 feet. I use it mostly for geocaching and it takes me directly to the spot (within 3 feet accuracy). The battery life is a little short with the backlight on. I turned off the backlight to conserve power and the batteries have so far lasted for over 6 hours and they are still half full.
Summary: Good point. GPSChip is SirfStartIII. The image map can be used. Bad point. Daytime: Dark screen. It is not easy to see. Night: The backlight is too bright. A reverse-route cannot be used. Why Others: Duration: With eneloop for about 15 hours (backlight OFF). Synthesis: There are a lot of points that should be improved. However, it is a trekking guide that can be trusted.