JRC JFS-280, Инструкция по эксплуатации

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5-5 5 Adjusting How Images Appear
5
3) Tilt Angle and the Appearance of the Reflection of the Sea Surface
When searching for schools of fish at the surface, depending on inclement weather and the
condition of the sea, detecting an image of a school of fish may become difficult due to the
influence of the reflection of the sea surface. In such cases, because the vertical beam is about
10° wide, images of the reflection of the sea surface may be decreased by using the stabilize
function and lowering the tilt angle to about 4° or 5°.
5.1.3 Images and Effects of Own Ship's Wake and the Wakes of Other Ships
1) Example of an image of own ship's wake and the wakes of another ship
Your own ship's wake and the wakes of other ships have characteristics, such as those in the
diagram, and can be easily differentiated from schools of fish.
2) Image of wake affects image of fish school
A large amount of foam is included in wakes. Therefore, wakes may dampen sound waves and
reduce long distance sensitivity.
Wake of other ship
School
of fish
Other ship
Propeller noise
Own ship
Fish echoes may be seen after the own ship
passes the wake of another ship.
10°
Tilt angle 0°
Tilt angle 5°
Reflection of the
sea surface
Other ship
Own ship
Wake of other ship
Own ship's
propeller noise