3-12 hsb
2
PLUS Series LCD Display
Changing the Targets
Display
Interference Rejection
Mutual radar interference is likelywhen two or more radar-equipped vessels
areoperating within range of each other. This usually appears as a seriesof
smalldots moving to and from the display center in a straightline or a long,
sweeping curve. This type of interference is most noticeable at long ranges.
Figure 3-10: Interference Rejection
The PathfinderPlusRadar includes a mechanism that automaticallyreduces
suchinterference.This mechanismis normally left switched on. However, if
you wish to detectthe presenceof other radars in the vicinity, you can turn off
theinterferencerejection.
Target Expansion
You can make targets easier to see by expandingthem. Targetexpansion uses
a combinationof signal processing techniques and pulselength overrideto
increasethe sizeof targetsseenonthescreen.However,thismaycompromise
rangeresolution.Two levels of targetexpansionare available,with level 2
providinggreaterexpansionthan level 1.
Target Wakes
You can see the direction and speed with which targetsare movingrelative to
yourvessel by selectingthe target wakes display option.
When wakes are switched on, the targetis displayed at the brightest level and
theprevious positions of targetsare retained at successively fainter levels on
thescreen. You can select long, mediumor short wakes, which retain
information from previous scans at a reduced video level.
You can clear existing wakes from the display by pressingthe CLEAR WAKES
softkey. The soft key is only availablewhen wakes are switched on; the
displaystartsshowingnew wakes as soon as the old wakes have been cleared.
Whenwakesareswitchedoff,nonewwakesaredisplayedandexistingwakes
arecleared.
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
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