I have a Temp NAV radio in my H2 which is not the correct model Number for my 2009 SUV Lux. My Original NAV is out for repair so I stuck another NAV Radio (Denso) in the hole till mine comes back, The NAV unit does show and track as I drive. But here's the rub. It shows me roughly about 100 feet back from cross roads as I approach them. When I do get to the cross road it shows me 100 feet ahead.

My question is... Is there a way to calibrate the unit to compensate for the error? My original NAV Radio was dead nuts on. This one is from a Tahoe or a GMC truck. Not sure what it came from. They all look the same and mount the same.

Any Suggestions..??