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GPSMAP 78 Quick Start Manual 7
Calibrating the Compass
notice
Calibrate the electronic compass
outdoors. Do not stand near objects that
inuence magnetic elds, 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.