Garmin GPS 120XL - Manual (Page 54)

Speed Filter (continued)
The speed filter allows you to determine how the
GPS 120XL 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 the
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 desirable 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 F .
2. Select the ‘ON’ option and press
F
.
3. Highlight the “speed value” field and press the
F
key.
4. Use
U
and
D
to select the desired number of
seconds.
5. Press the F key to confirm the selection.
Magnetic Heading Reference
The GPS 120XL’s heading information can be dis-
played referencing magnetic north (auto or user-
defined), true north or calculated grid headings. The
default setting is automatic magnetic north, which is
suitable for most applications.
Speed Filter &
Magnetic
Heading
REFERENCE
50
Setting the speed filter to
‘On’ makes it possible for
you to select the receiver’s
time response to changes in
track or ground speed.
The number entered repre-
sents a window of time the
GPS 125 Sounder 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.
120XL Man RevB 7/10/98 10:55 AM Page 50