Selecting Training Sector Quickly; Suppressing Bottom And Sea Surface Reflections In Shallow Fishing Grounds - Furuno CH-37 Operator's Manual

Furuno color sector scanning sonar operator's manual model ch-37

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2.9 Selecting Training Sector Quickly

2.10 Suppressing Bottom and Sea Surface Reflections

in Shallow Fishing Grounds

Normally the training sector is selected by the SECTOR con-

trol. To the training sector more quickly, however, use the FULL/

HALF key. This key allows switching between full circle and

half circle training sector in a single key stroke.

SECTOR

Figure 2-9 How the SECTOR control and FULL/HALF key work

In shallow fishing grounds, excessive sea surface and bottom

reflections often interfere with wanted fish echoes and they can-

not be eliminated sufficiently with the aforementioned TVG con-

trols. In such cases, try to reduce the output power from C to B

or A on the SONAR menu, without turning down the gain. The

picture becomes clearer when output power is reduced rather

than when the gain is decreased, as illustrated below.

FULL CIRCLE

FULL/HALF

HALF CIRCLE

key

2-11

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