Units Of Measure - Garmin GPS 12XL Owner's Manual & Reference

REFERENCE
Datums, CDI
Settings, &
Measurement
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.
To enter a user-defined
magnetic variation, select
the 'User Mag' option and
enter the desired direction
and value.
44
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 values for 'DX', 'DY', 'DZ', 'DA', and 'DF' using the
rocker keypad, and press
4. Highlight 'SAVE?', and press
will reappear.
CDI Scale Settings
The course deviation indicator (CDI) field lets you
select the +/- range of the CDI bar scale on the Highway
Page. Three scales are available: +/- 0.25 (default), 1.25,
and 5.0 miles or kilometers. Note: This CDI value rep-
resents the full deflection of scale to either side.
To enter a CDI scale setting:
1. Highlight the 'CDI SCALE' field, and press
2. Select the desired setting, and press

Units of Measure

The GPS 12XL lets you select statute (default), nau-
tical, or metric units of measure for all "speed" and "dis-
tance" fields.
To change the unit of measure:
1. Highlight the 'UNITS' field, and press
2. Select the desired unit of measure, and press
Magnetic 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 automatic 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 preference, and press
E
.
To enter a user-defined magnetic heading:
. 1. Select 'User Mag' and press
2. Enter the degrees and direction of magnetic variation,
E
and press
E
.
E
.
E
. The setup menu
E
E
E
.
.
E
.
E
.
.
.
E
.
E
.