Garmin GPSMAP 235 Sounder - Manual (Page 90)

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Navigation Setup (con’t.)
• CDI Scale: Provides a list of six CDI scale settings for the Map Page CDI: +/-0.10,
0.50, 1.0 (default), 5.0, 10.0 and 25.0 miles or kilometers. The scale represents the
distance from the center of the scale to either end of the scale.
• 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 sounder.
For a list of the available map datums, see Appendix D. (The default setting is
WGS 84).
• Velocity Filter: Allows you to select the sounder’s 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 receiver’s 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.
SECTION
10
SETUP MENUS
Navigation Setup
A B
A. CAUTION! Using the incorrect map datum can
seriously effect the accuracy of your GPS receiver.
The GPS datum should always match the datum of
the local chart you are using. If no datum informa-
tion is indicated on the charts you are using, contact
the chart manufacturer.
B. Keeping the velocity filter on the ‘Auto’ setting will
allow the sounder to automatically monitor and
adjust the response time for track and speed calcu-
lations.
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