I have no problem with my Explorist 400 but I do have problems with connecting it to a computer. My old computer has USB1 connections that didn't work and the new one has Windows Vista and it will not recognize the GPSr to download waypoints to it. Mapsend 3D also will not load with Vista. Magellan's support system was nonexistant when asked questions but they were able to send me many customer service surveys to see if the question was answered.