Note –
Press firmly when inserting the power cable and transducer cable to ensure a tight seal.
8.When you press the PWR button, the display unit should turn on. If the unit will not turn on and you suspect that you may have reversed the power connections, check the DC power lines all the way back to the battery. If the polarity is not correct, reconnect the leads properly and try again.
Calibrating the Sensors
The transducer most often used with this unit includes sensors for boat speed and water temperature. These sensors are normally very accurate, but you may want to calibrate them. The procedure appears on page 64. See the section on “System Setup Menu.”
The speed indication on your FishFinder is usually very accurate. How- ever, there are some special cases where the speed reading may be high or low. This means that the speed of the water past the transducer may not be the same speed that your boat moves through the water. The hull of the boat may have a shape which channels water past the transducer at a speed which is faster or slower than normal.
1.To calibrate the speed sensor, set up a course between two known points. As markers you can use buoys, range markers, or landmarks. Measure the length of time the boat takes to cover a known distance.
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 Menu. 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
24 | Installation |
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