Garmin GPS 12XL Owner's Manual (Software Version 4.0 and above) - Page 49

Navigation Setup: Units of Measure

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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 . The signs of each value should follow 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 distance 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 userdefined), 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 . REFERENCE Navigation Setup The user datum feature allows you to define the earth model used to calculate position coordinates. WARNING: Incorrect entries may result in substantial position errors. To enter a user-defined magnetic variation, select the 'User Mag' option and enter the desired direction and degrees. 45

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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
.
The signs of each value should fol-
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
.
45
The user datum feature
allows you to define the
earth model used to calcu-
late position coordinates.
WARNING
:
Incorrect
entries may result in sub-
stantial position errors.
REFERENCE
Navigation
Setup
To enter a user-defined
magnetic variation, select
the ‘User Mag’ option and
enter the desired direction
and degrees.