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PLUS Series LCD Display
Changing the Targets
Display
Interference Rejection
Mutual radar interference is likely when two or more radar-equipped vessels
are operating within range of each other. This usually appears as a series of
small dots moving to and from the display center in a straight line or a long,
sweeping curve. This type of interference is most noticeable at long ranges.
Figure 3-10: Interference Rejection
The Pathfinder Plus Radar includes a mechanism that automatically reduces
such interference. This mechanism is normally left switched on. However, if
you wish to detect the presence of other radars in the vicinity, you can turn off
the interference rejection.
Target Expansion
You can make targets easier to see by expanding them. Target expansion uses
a combination of signal processing techniques and pulse length override to
increasethe sizeof targetsseen on the screen. However,thismay compromise
range resolution. Two levels of target expansion are available, with level 2
providing greater expansion than level 1.
Target Wakes
You can see the direction and speed with which targets are moving relative to
your vessel by selecting the target wakes display option.
When wakes are switched on, the target is displayed at the brightest level and
the previous positions of targets are retained at successively fainter levels on
the screen. You can select long, medium or short wakes, which retain
information from previous scans at a reduced video level.
You can clear existing wakes from the display by pressing the CLEAR WAKES
soft key. The soft key is only available when wakes are switched on; the
display starts showing new wakes as soon as the old wakes have been cleared.
Whenwakes areswitched off,no newwakesare displayedand existingwakes
are cleared.
INT REJ
OFF ON
D1639-1
EXPANSION
OFF 1 2
WAKES
OFF S M L
CLEAR
WAKES
81186_3.book Page 12 Thursday, August 22, 2002 8:23 AM