Raymarine hsb2 Series, Owner'S Handbook Manual

Page: 77 / 231

3-12 HSB Series Color LCD Display
Ch
an
gi
ng
th
e
Ta
rgets D
ispl
ay
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 centre 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 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
On radome scanner ranges from ½ nm to 3 nm and open array ranges from
1
/
8
to 3 nm you can make targets easier to see by expanding them. Target
expansion overrides the normal pulse length, thereby increasing the size of the
target seen on the screen. However, this is at the expense of range resolution.
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.
When wakes are switched off, no new wakes are displayed, but existing wakes
are retained.
INT REJ
OFF ON
D1639-1
EXPANSION
OFF ON
WAKES
OFF S M L
CLEAR
WAKES