Garmin GPSMAP 3006C, 3010C Owner's Manual

Also see for GPSMAP 3006C: Specification Install guide Installation instructions Owner's manual Quick reference guide

Contents

GPSMAP 3006C/3010C Owner’s Manual 63MaIn Menu > sYsteM tabM aInM enu• Map Datum—manually select the datum reference used to determinea given location. The default setting is WGS 84. The unit automaticallyselects the best datum depending on your chosen position format. Datumsare used to describe geographic locations for surveying, mapping, andnavigation and are not actual maps built in the unit. Although more than100 datums are available, you should change the datum only if you areusing a map or chart that specifies a different datum.WARNING: Selecting the wrong map datum can result in substantialposition errors. When in doubt, use the default WGS 84 datum for best overallperformance.• temperature—set the units of measure for temperature in Fahrenheit (°F)or Celsius (°C). You must be receiving NMEA Sonar temperature data orusing a Garmin Sonar Module for the temperature to appear.• Distance, Speed, and Elevation—set the units of measure for distance,speed and elevation readouts in Nautical (nm, kt, ft), Nautical (nm, kt, m),Statute (mi, mh, ft), or Metric (km, kh, m) terms.• Pressure—set the units of measure you want to use for weather readoutsin Inches Mercury (in), Millibars (mb), or Hectopascals (hPa). You must beusing a Garmin weather product for this data to appear.• heading—set the reference used in calculating heading information. Youcan select Auto Mag Var, true, Grid, and User Mag Var. Auto MagVar provides magnetic north heading references that are automaticallydetermined from your present location. True provides headings basedon a true north reference. Grid provides headings based on a grid northreference. User Mag Var allows you to specify the magnetic variation atyour present location and provides magnetic north heading referencesbased on the variation you enter.WARNING: If you select User Mag Var, you must periodically update themagnetic variation as your location changes. When using this setting, theGPSMAP 3006C/3010C unit does not automatically calculate and update themagnetic variation at your present location. Failure to update this setting canresult in substantial differences between the information displayed on your unitand external references, such as a magnetic compass.To enter a user-defined magnetic variation:1. With the Heading field set to User Mag Var, highlight the headingreference field (immediately to the right), and press ENTER.2. Enter the magnetic variation at your current location, and press ENTER.Time Sub TabUse the Time sub tab to adjust the time format, enter a time zone, and adjust forDaylight Saving Time to show the correct local time.