How long have you been using it? On mine, it took forever to update from the previous owner's location to mine. I think it had something to do with the large distance between the two areas. I haven't specifically read this related to the D3, but in most GPS units the software assumes that, when acquiring a signal, you are near the last known location of the unit. If you are not (eg, more than 150 miles distant from last known location), the unit requires much longer to "find" your current location. During this time, the unit is sifting through the data streams received from the GPS satell