Chapter 8: Using the Radar (Digital) 197
8.9 Tuning the radar display:
Gain
Gain reduces the effect of false echoes and clutter. For best results, it is
recommended you retain the default AUTO setting. You can, however, adjust gain
settings manually if required.
Gain presets
There are four preset gain modes to give you the best picture in different
circumstances.
Harbor is the default mode. This setting takes account of land clutter so that
smaller targets, like navigation buoys, are not lost.
Coastal accounts for the slightly higher levels of sea clutter you might encounter
out of harbor and adjusts the radar display accordingly.
Offshore automatically adjusts for high levels of sea clutter.
Buoy is a special mode to enhance the detection of small objects like mooring
buoys. It is useful at ranges up to 3/4 nm.
Manually adjusting gain settings
The gain settings function makes the radar picture clearer by changing the sensitivity
of radar reception.
• For long ranges select a sensitivity level that gives a slight speckle in the back-
ground. Setting the gain too low can cause weak or small targets to disappear,
however.
• For shorter ranges reduce the gain slightly to reduce speckle and improve tar-
get definition.
Note:
If you control gain manually, check it each time you change the range scale.
To manually adjust gain settings
1. Press the GAIN softkey.
2. Select a pre-set you want to adjust i.e. ‘COASTAL MODE’.
3. Press ADJUST to display the adjustment toolbar.
4. Press the softkey you want to change the value for.
5. Once MAN is shown, and the value percentage slider is displayed above the
softkey, use the rotary control to change the value up and down.
6. Press OK or CANCEL to return to the top level.
The changes you make are applied to both the active window and any other radar
windows displaying this preset. Gain setting changes are kept at system power-off.
81244_4.book Page 197 Thursday, January 31, 2008 1:53 PM
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