Furuno CH-37 - Manual (Page 49)

3-5
3.5 Automatic Shifting of Own Ship Position
Own ship position on the screen is shifted automatically either
rightward or leftward according to the direction of the sector
center and the display sector width.
The figure below shows the own ship position has been shifted
rightward on the screen to provide the wider view at port side.
Sector
center
Display
sector
Figure 3-5 Automatic shift function
3.6 Rejecting Sonar Interference and Noise
While observing the picture, you may encounter occasional or
intermittent noise and interference as shown below. This is
mostly caused by onboard electronic equipment, engine, pro-
peller noise, or electrical noise from other sonars being oper-
ated nearby. Turn on the interference rejector (IR) in the SONAR
menu to reduce or eliminate the interference.
Figure 3-6 Interference and noise