Furuno CH-500, Operator'S Manual

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1. OPERATIONAL OVERVIEW
1-11
1.8.5 Interference from other equipment
While observing the sonar picture, you may encounter occasional or intermittent noise
and interference. These are mostly caused by on-board electronic equipment, engine
or propeller noise, or electrical noise from other sonars being operated nearby.
Typical interference is displayed on-screen in a manner similar to the figure below.
You can suppress this kind of interference by using the interference rejector.
To use the interference rejector, do the following:
1. Press the MENU key to open the menu.
2. Press
S
to select the menu bar.
3. Press
X
or
W
to select [COM1].
4. Press
T
to select [Interference], then press
X
to show the [Interference] settings.
5. Press
X
to select [On]. The interference rejector is now active. The IR indicator
( ) is shown in the following location, depending on the display mode in use.
• All Horizontal modes: Top-right of the screen.
• Vertical and Echo Sounder modes: Top-left of the screen
6. Press the MENU key to close the menu and apply the changes.
To disable the interference rejector, repeat the above procedure and, at step 5, press
W
to select [Off].
1.8.6 Interference from marine life
Marine life, such as plankton, can cause interference. The interference rejector can
suppress this type of interference.
To use the interference rejector, see section 1.8.5.