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CDI Steer To allows you select a steer-to-center or steer-to-D-Bar orientation for
graphic steering guidance. The steer-to-center selection displays your position as the
vertical line on the scale, and your desired track as the center of the scale. The steer
to D-Bar option displays your position as the center of the scale, with the desired
track as the vertical line. The default setting is steer to center.
Map Datum provides a list of the available map datums for use with the GPSMAP
system. For a list of the available GPSMAP datums, see Appendix D. The default set-
ting is WGS 84.
Velocity Filter allows you to select the GPSMAPs response time to changes in track
or ground speed. Three settings are available: automatic, on, or off. The auto
(default) setting will monitor the changes in your current track and speed and
adjust the receivers response time automatically. The on setting allows you to
manually enter a response time up to 240 seconds. Selecting a higher setting may be
desirable in slow-speed applications with frequent changes in track.
To enter a user defined velocity filter value:
1. Highlight the Velocity field and press
T
. Select the On option and
press
T
.
2. Highlight the time value field.
3. Press
T
.
4. Enter a value in seconds (up to 240) and press
T
to confirm.
A
B
61
A. CAUTION! Using the incorrect map datum can
seriously effect the accuracy of your GPS receiv-
er. The GPS datum should always match the
datum of the local chart you are using. If no
datum information is indicated on the charts
you are using, contact the chart manufacturer.
B. Keeping the velocity filter on the Auto setting
will allow the GPSMAP 180 to automatically
monitor and adjust the response time for track
and speed calculations.
SECTION
9
SETUP MENUS
Navigation Setup