Ok...I scanned the responses and didn't see anything about this so I will add my two cents. I have a Sportrak color and YES you can calibrate the GPSr. I don't know of any other Magellan that can be (or has to be) calibrated, but this one has to be recalibrated every time you change batteries. Press your Menu button and go to Setup...towards the bottom of the list is Calibrate. The system will walk you through the steps. This must be done every time you change batteries and your GPSr should prompt you to do so.
