Garmin GMI 20 Marine Instrument Quick Start Manual - Page 10

• True-sets true north as the heading reference. • User Mag Var-allows you to set the magnetic variation value. Beeper-set when the GMI 10 makes audible sounds. Auto Power-select if the unit powers on with the NMEA 2000 network. Language-select the on-screen language. Operating Mode-set the GMI 10 for normal operation or for a store demonstration. Position-specify how the GMI 10 handles coordinates and maps. • Position Format-change the coordinate style in which a given location reading appears. • Map Datum-change the coordinate system in which the map is structured. Caution: Do not change the position format or map datum unless you are using a map or chart that specifies a different position format or map datum. Time-specify how the GMI 10 handles time information. • Time Format-select a 12 hour, 24 hour, or UTC time format. • Time Zone-set the time zone you want to use for time readings. 10 GMI 10 Quick Start Manual