Customizing Your Device Map Datum —sets the coordinate system on which the map is structured. Map Spheroid —shows the coordinate system the device is using. The default coordinate system is WGS 84. useful when you are watching for pressure fronts. Save Always —records pressure data every 15 minutes, even when the device is turned off. Plot Type Altimeter Settings From the main menu, select Setup > Altimeter . Auto Calibration —the altimeter to self-calibrates each time you turn the device on. Barometer Mode 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. Variable Elevation —the barometer functions while you are moving. Fixed Elevation —the barometer functions while you are stationary. Pressure Trending Save When Power On —records pressure data only when the device is turned on. This can be 28 GPSMAP 78 Series Owner’s Manual