Compass —allows you to switch from an electronic compass to a GPS compass when you are traveling at a higher rate of speed for a set period of time, or turns the compass off. Select To Begin —starts the compass calibration ( page 13 ). Change Plot Type —sets the type of data shown on the elevation plot: Using the Main Pages Elevation/Time —records elevation changes over a period of time. Elevation/Distance —records elevation changes over a distance. Barometric Pressure —records barometric pressure over a period of time. Ambient Pressure —records ambient pressure changes over a period of time. Adjust Zoom Ranges —adjusts the zoom ranges shown on the elevation plot page.
Reset —resets the elevation plot data: Elevation Plot note : The elevation plot page is available only with the GPSMAP 78S and GPSMAP 78Sc. Calibrating the Barometric Altimeter 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. Reset Trip Data —resets all trip data. Delete All Waypoints —deletes all saved waypoints. Elevation Plot Setup Options From the elevation plot, press menu . GPSMAP 78 Series Owner’s Manual 15