Garmin GPSMAP 3005C User Manual download pdf (Page 67)

GPSMAP 3005C Owner’s Manual 59

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• Map Datum—manually select the datum reference used to determine

a given location. The default setting is WGS 84. The unit automatically

selects the best datum depending on your chosen position format. Datums

are used to describe geographic locations for surveying, mapping, and

navigation and are not actual maps built into the unit. Although more than

100 datums are available, you should change the datum only if you are

using a map or chart that species a different datum.

WARNING: Selecting the wrong map datum can result in substantial

position errors. When in doubt, use the default WGS 84 datum for best overall

performance.

• Temperature—set the units of measure for temperature in Fahrenheit (°F)

or Celsius (°C). You must be receiving NMEA Sonar temperature data or

using 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 readouts

in Inches Mercury (in), Millibars (mb), or Hectopascals (hPa). You must be

using a Garmin weather product for this data to appear.

• Heading

—set the reference used in calculating heading information. You

can select Auto Mag Var, True, Grid, and User Mag Var. Auto Mag

Var provides magnetic north heading references that are automatically

determined from your present location. True provides headings based

on a true north reference. Grid provides headings based on a grid north

reference. User Mag Var allows you to specify the magnetic variation at

your present location and provides magnetic north heading references

based on the variation you enter.

WARNING: If you select User Mag Var, you must periodically update the

magnetic variation as your location changes. When using this setting, the

GPSMAP 3005C unit does not automatically calculate and update the magnetic

variation at your present location. Failure to update this setting can result in

substantial differences between the information displayed on your unit and

external references, such as a magnetic compass.

To enter a user-dened magnetic variation:

1. With the Heading eld set to User Mag Var, highlight the heading

reference eld (immediately to the right), and press ENTER.

2. Enter the magnetic variation at your current location, and press ENTER.

Time Sub Tab

Use the Time sub tab to adjust the time format, enter a time zone, and adjust for

Daylight Saving Time to show the correct local time.

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Garmin GPSMAP 3005C User Manual Page 67

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