Garmin GPS 48 Owner's Manual - Page 54

Map Datums, CDI, Units &amp, Heading

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REFERENCE Map Datums, CDI, Units & Heading 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. Three different units of measure allow you to select the correct unit for your area or use. Map Datums (continued) To select a map datum: 1. Highlight the 'MAP DATUM' field, and press E. 2. Select the desired setting, and press E. To define a user datum: 1. Highlight the 'MAP DATUM' field, and press E. 2. Scroll through the map datum options until 'User' appears, and press E. 3. Enter values for 'DX', 'DY', 'DZ', 'DA', and 'DF' using the rocker keypad, and press E. 4. Highlight 'SAVE?', and press E. The setup menu 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 represents the full deflection of scale to either side. To enter a CDI scale setting: 1. Highlight the 'CDI SCALE' field, and press E. 2. Select the desired setting, and press E. Units of Measure The GPS 48 lets you select statute (default), nauti- cal, or metric units of measure for all "speed" and "distance" fields. To change the unit of measure: 1. Highlight the 'UNITS' field, and press E. 2. Select the desired unit of measure, and press E. Magnetic Heading Reference The GPS 48's heading information can be displayed 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. The heading units can be configured to display in degrees or mils. 50

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Map Datums (continued)
To select a map datum:
1. Highlight the ‘MAP DATUM’ field, and press
E
.
2. Select the desired setting, and press
E
.
To define a user datum:
1. Highlight the ‘MAP DATUM’ field, and press
E
.
2. Scroll through the map datum options until ‘User’
appears, and press
E
.
3. Enter values for ‘DX’, ‘DY’, ‘DZ’, ‘DA’, and ‘DF’ using the
rocker keypad, and press
E
.
4. Highlight ‘SAVE?’, and press
E
. The setup menu
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
represents the full deflection of scale to either side.
To enter a CDI scale setting:
1. Highlight the ‘CDI SCALE’ field, and press
E
.
2. Select the desired setting, and press
E
.
Units of Measure
The GPS 48 lets you select statute (default), nauti-
cal, 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
E
.
2. Select the desired unit of measure, and press
E
.
Magnetic Heading Reference
The GPS 48’s heading information can be displayed
referencing magnetic north (automatic or user-defined),
true north, or calculated grid headings.
The default set-
ting is automatic magnetic north, which is suitable for
most applications.
The heading units can be configured
to display in degrees or mils.
Map Datums,
CDI, Units &
Heading
REFERENCE
50
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.
Three different units of
measure allow you to
select the correct unit for
your area or use.