Raymarine Chartplotter RL70CRC PLUS manual Interference Rejection, Target Expansion, Target Wakes

3-12 hsb2 PLUS Series Color LCD Display

INT REJ

OFF ON

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.

D1639-1

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.

EXPANSION

OFF ON

Target Expansion

You can make targets easier to see by expanding them. The scanner type determines the range at which target expansion is available. 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.

WAKES

OFF S M L

CLEAR

WAKES

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 and existing wakes are cleared.