Magnetic Heading Reference - Garmin 128 Owner's Manual

To change the unit of measure:
1. Highlight the 'units' field, and press
2. Select the desired unit of measure, and press
Speed Filter
The speed filter allows you to determine how the
GPS 126/128 responds to changes in track or ground
speed. Three settings are available: automatic, on, or
off. The 'Auto' setting is the default and will monitor
changes in your current track and speed and adjust the
receiver' s response time automatically. The 'On' setting
allows you to manually enter a response time up to
300 seconds. Selecting a higher setting may be desir-
able in slow-speed applications with frequent changes
in track.
To enter a value for the speed filter:
1. Highlight the 'SPEED FILTER' field and press
2. Select the 'ON' option and press
3. Highlight the "speed value" field and press the
key.
U
4. Use and
seconds.
F
5. Press the

Magnetic Heading Reference

The GPS 126/128' 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
F
.
To enter a user-defined magnetic heading:
. 1. Select 'User Mag' and press
F
2. Press , enter the degrees and direction of mag-
netic variation, then press
F
F
D
to select the desired number of
key to confirm the selection.
F
.
F
.
.
F
.
F
.
.
F
F
.
REFERENCE
Speed Filter and
Magnetic
Heading
The number entered repre-
sents a window of time the
GPS 126/128 considers in
adjusting to changes in
speed and track. For exam-
ple, if 12 seconds is entered,
the speed displayed will
constantly represent the
speed averaged over the last
12 seconds.
To enter a user-defined
magnetic variation, select
the 'User Mag' option and
enter the desired direction
and value.
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