L750 Fishfinder: Installation and Operation Handbook
26
2. You may also use locations indicated by a G.P.S. or Loran unit. (If
you choose this method, remember that these devices measure
“speed over ground” or “speed over the bottom.” Tides, currents, or
winds can create a difference between the FishFinder’s “speed
through water” measurement and the boat’s “speed over ground.”
Before calibrating using a G.P.S. or Loran unit, wait for still water or
slack tide conditions.
3. If the display unit is reading high or low, you can correct for this using
the entry for “Speed Cal.” (To reach Speed Cal, go to the System
Setup display. This is described in Section 4.) The entry for Speed
Cal is a percentage. An entry of “100” equals 100%, meaning that
there is no correction. If the display unit is producing a
low
reading,
use a
higher
value for Speed Cal. If the display unit is reading
high
,
use a
smaller
number for Speed Cal. You may enter any value
between 75 and 125.
4. The temperature sensor is usually very accurate, but you can adjust
the calibration using the entry for “Temp Cal.”
Final note: After you finish the installation, please remember to fill out
the Warranty Card included with this manual.
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