You could try leaving GPSJinni on for a bit so it gets a good lock on the satellites, then compare the gps coordinates it gives with Google Earth or a similar application. That might indicate if it's an accuracy problem with the gps or OVI maps. You could also try the geolocation plugin for the browser. I haven't tried these before so I don't know if this is helpful. For what it's worth, the GPS is very accurate for me.