Raytheon HSB L755, Owner'S Handbook Manual

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7-12 HSB Series L755 and L760 Fishfinder
So
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r Sim
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If the Fishfinder reading is too low, set Temperature Calibration to a positive
value. If the Fishfinder reading is to high, set Temperature Calibration to a
negative value.
Sonar Simulator
The simulator allows you to operate your display without data from the
transducer, in order to become familiar with the fishfinder features and
functions.