Furuno CH-300 Operator's Manual page 73

3. VERTICAL SCAN MODE
Display of net hauling
This is an example of net hauling display. The location of the net is indicated clearly.
Own ship Aft
FORE
AFT
Net
Net hauling and sonar picture
False echo
In shallow water (depth less than 100 m) detection, unwanted echoes shown in the figure
may appear. This phenomenon is caused by the false echo from the previous transmission.
Reducing the Tx rate (on the COM1 menu) or lowering the range may lessen this effect.
PORT STBD
False echo
Bottom Fish
Range
False echoes
3-15