Bedienungsanleitung Garmin GPSMAP 238 (Seite 96 von 134) (Englisch)

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Reference

Main Menu: Units Tab

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

tion. The default setting is ‘WGS 84’. The unit will automatically choose 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 104-105), you should only change the datum if you are using a map or

chart that speciﬁ 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.

• 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 73). ‘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 deﬁ ned magnetic variation:

1. With the Heading ﬁ eld set to ‘User Mag Var’, highlight the heading reference ﬁ eld (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), ‘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).

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

periodically update the magnetic variation as your position

changes. Using this setting, the unit will 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 will affect how navigation informa-

tion is displayed on the GPSMAP 188/188C/238 Sounder.

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 188/188C/238 Sounder 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.

188188C238 Manual Part 2.indd 86 6/30/2003, 3:32:32 PM

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