Thanks for the replies. I think the name is worth more, at least high xxxx, given the amount of searches and expected growth of the market (676 million expected GPS units to be sold in 2012, up from 155 mm last year). Plus it is in top 8 of GPS related search terms. It is a considerably more popular search term than any terms from the following sales from last year;
PortableGPS.com 4,500
GPsDevice.com 1,050
GPsDevices.com 3,123
SmartGPs.com 3,500
GPSInfo.com 10,000
CarNavigationGPS.com 2,461
GPSexplorer.com 2,049
GPSTransmitters.com 1,250
GPSMapping.com 8,516
Just my opionon of course, but I think given these sales, with some of these terms having very little search volume, Handheldgps.com is probably better than any of them, except maybe GPSDevices.com (even though, again, it has less seach traffic than my name) which I think was a steal for whoever bought it.
Thanks again.