Navigation Setup - Garmin GPS 12XL Owner's Manual & Reference

Navigation Setup: Map Datums (continued)
To define a user datum:
1. Highlight the 'MAP DATUM' field, and press
2. Scroll through the map datum options until 'User'
appears, and press
3. Enter the five parameters of the map datum—'DX',
'DY', 'DZ', 'DA', and 'DF'—using the rocker keypad,
and press
low the convention: WGS 84 +/- local geodetic system.
4. Highlight 'SAVE?', and press
Navigation Setup: CDI Scale
The course deviation indicator (CDI) field lets you
select the range of the CDI bar scale on the Highway
Page. Four scales are available: +/- 0.02, 0.25 (default),
1.25, and 5.0 miles or kilometers. Note: This CDI
value represents the full scale limits (left or right from
center) of the CDI.
To enter a CDI scale setting:
1. Highlight the 'CDI' field, and press
2. Select the desired setting, and press
Navigation Setup: Units of Measure
The GPS 12XL lets you select statute (default), nau-
tical, or metric units of measure for all speed and dis-
tance readouts.
To change the unit of measure:
1. Highlight the 'UNITS' field, and press
2. Select the desired units of measure, and press
Navigation Setup: Heading Reference
The GPS 12XL' s heading information can be dis-
played referencing magnetic north (automatic or user-
defined), true north, or calculated grid headings. The
default setting is automatically-calculated magnetic
north, which is suitable for most applications.
To select a heading reference:
1. Highlight the 'HEADING' field, and press
2. Select the desired heading reference, and press
To enter a user-defined magnetic heading:
. 1. Select 'User Mag' and press
2. Enter the degrees and direction of magnetic variation,
and press
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. The signs of each value should fol-
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REFERENCE
Navigation
Setup
The user datum feature
allows you to define the
earth model used to calcu-
late position coordinates.
WA R N I N G: Incorre c t
entries may result in sub-
stantial position errors.
To enter a user- d e f i n e d
magnetic variation, select
the 'User Mag' option and
enter the desired direction
and degrees.
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