Garmin GPSMAP 3010C - Manual (Page 70)

62 GPSMAP 3006C/3010C Owner’s Manual
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5. Press up or down on the ROCKER to increase or decrease the backlight
level, and press ENTER.
6. To adjust the offset minutes, select the minutes field, and press ENTER.
7. Enter the offset minutes for Before Sunrise or After Sunset. If zero, the
unit automatically changes to the specified level at sunrise/sunset. Press
QUIT to exit.
Units Sub Tab
Use the Units sub tab to define settings for Position Format, Depth, Map Datum,
Temperature, Distance, Speed, and Elevation, Pressure, and Heading.
WARNING: The Units sub tab settings affect how navigation information
appears on the GPSMAP 3006C/3010C. If you are using a map or chart with
your GPS, make sure the settings on the Units sub tab match that of the map
or chart. This information should be shown somewhere on the map or chart. If
not, contact the map or chart maker to determine what position format, datum,
heading, and units of measure are used for the map or chart.
The following settings are available:
• Position Format—used to change the coordinate system in which a given
location reading appears. Only change the position format if you are using
a map or chart that specifies a different position format or you want to use a
format you are familiar with. The default format is latitude and longitude in
degrees, minutes, and thousandths of a minute (hddd°mm.mmm’).
• Depth—select the units of measure for depth in Feet (ft), Fathoms (fa),
or Meters (m). You must be receiving NMEA Sonar depth data or using a
Garmin Sonar Module for the depth to appear.