Manual Garmin GPSMAP 172C (page 81 of 109) (English)

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• Map Datum – allows you to manually select the datum reference used to determine a given position.

The default setting is ‘WGS 84’. The unit automatically chooses the best datum depending upon

your chosen position format. Datums are used to describe geographic positions for surveying,

mapping, and navigation and are not actual maps built in the unit. Although over 100 datums are

available (as listed on pages

83-84

), you should only change the datum if you are using a map or

chart that speciﬁes a different datum.

WARNING: Selecting the wrong map datum can result in substantial position errors.

• Heading – lets you select the reference used in calculating heading information. You can select from

‘Auto Mag Var’, ‘True’, ‘Grid’ and ‘User Mag Var’. ‘Auto Mag Var’ provides magnetic north heading

references which are automatically determined from your current position. ‘True’ provides headings

based upon a true north reference. ‘Grid’ provides headings based on a grid north reference (and

is used in conjunction with the grid position formats described on page 70). ‘User Mag Var’ allows

you to specify the magnetic variation at your current position and provides magnetic north heading

references based upon the variation you enter.

To enter a user deﬁned magnetic variation:

1. With the Heading ﬁeld set to ‘User Mag Var’, highlight the heading reference ﬁeld (immediately to

the right) and press ENTER.

2. Use the ARROW KEYPAD to enter the magnetic variation at your current position and press

ENTER.

• Distance, Speed and Elevation – lets you select the desired 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.

• Depth – lets you select the desired units of measure for depth in Feet (ft), Fathoms (fa) or Meters (m).

• Temperature – lets you select the desired units of measure for temperature in Fahrenheit (°F) or

Celsius (°C).



Main Menu: Units Tab

WARNING: If ‘User Mag Var’ is selected, you must

periodically update the magnetic variation as your position

changes. Using this setting, the unit does not automati-

cally calculate and update the magnetic variation at your

present position. Failure to update this setting may result in

substantial differences between the information displayed

on your unit and external references, such as a magnetic

compass.



The Units tab settings affect how navigation information is

displayed on the GPSMAP 172/172C. When in doubt, seek

assistance.

If you are using a map or chart in conjunction with your

GPS, make sure the settings under the ‘Units’ tab of the

GPSMAP 172/172C match that of the map or chart. This

information should be displayed somewhere on the map or

chart. If the information is not present, contact the map or

chart maker to determine what position format, datum,

heading and units of measure are being used for the map

or chart.



Reference

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Garmin GPSMAP 172C Manual

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