Garmin GPS III User Manual download pdf (Page 78)

Units Settings

Distance & Speed lets you select the desired units of measure for distance and speed

readouts in ‘Nautical’, ‘Statute’ or ‘Metric’ terms.

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 posi-

tion formats described on page 74). ‘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.

Altitude lets you select altitude readouts in ‘Feet’ or ‘Meters’.

To select a units setting:

1. Highlight the desired field and press ENTER to display the available options.

2. Select the desired option and press ENTER.

3. If ‘User Mag Var’ is selected in the ‘Heading’ field, highlight the heading reference field (immed-

iately to the right) and press ENTER. Enter the magnetic variation at your current position using

the rocker keypad and press ENTER.

WARNING: If ‘User Mag Var’ is selected, you must periodically update the magnetic vari-

ation as your position changes. Using this setting, the GPS III will not automatically cal-

culate 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

GPS III and external references, such as a magnetic compass.

Select nautical, statute or

metric units of measure from

the ‘Units’ settings.

The ‘User Mag’ option allows

you to define the magnetic

variation for your area. ‘Auto

Mag Var’ is the preferred set-

ting in most cases.

REFERENCE

Setup Menu: Units

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Garmin GPS III User Manual Page 78