Furuno CSH-53 manual Reducing Sea Surface Reflections, Boosting Tx Power

Reducing Sea Surface Reflections

Sea surface reflections can be reduced by sharpening the hori- zontal Rx beam width with the NARROW key. You may preset the reduction level with NARROW in the SONR•BEAM menu in the data setting window. The normal setting is 0. Increase the setting when, for example, searching small fish. Note that it is also useful to increase the setting when observing bottom condi- tions, since the picture is more detailed.

Boosting Tx Power

When the NARROW key is turned on sea surface reflections are suppressed, but small fish echoes are also suppressed. In this case the “boost” feature may be useful.

Press the BOOST key to light the lamp above it. Tx power in- creases and small fish school echoes are stressed.

When its use is not required turn off the BOOST key.

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