Garmin GPSMAP 78s Quick Start Manual - Page 7

Calibrating the Compass notice Calibrate the electronic compass outdoors. Do not stand near objects that influence magnetic fields, such as cars, buildings, or overhead power lines. note: The three-axis compass is available only with the GPSMAP 78s and GPSMAP 78sc. You should calibrate the compass after moving long distances, experiencing temperature changes, or changing the batteries. 1. From the compass, press MENU. 2. Select Calibrate Compass > Start. 3. Follow the on-screen instructions. Calibrating the Barometric Altimeter note: The elevation plot page is available only with the GPSMAP 78s and GPSMAP 78sc. You can manually calibrate the barometric altimeter if you know the correct elevation or the correct pressure. 1. From the elevation plot, press menu. 2. Select Calibrate Altimeter. 3. Follow the on-screen instructions. Trip Computer The trip computer displays your current speed, average speed, maximum speed, trip odometer, and other helpful statistics. GPSMAP 78 Quick Start Manual