I was wondering if any of the websites that I have come across can be considered reliable and/or comprehensive in the reviews they present regarding handheld gps units. I'm new to this technology,and was wondering what I should be looking for. It would be used for navigation through the desert and mountains, both in vehicles and on foot, but I'm not sure which features are required/helpful,or necessary beyong accuracy and the unit being waterproof. Any help would be appreciated either in pointing me to a site or with recomendations here. Thanks for the help as always.-- Ian