Garmin GPSMAP 178C Sounder Manuel d'utilisateur télécharger pdf (Page 110)

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Appendix A

Testing the Installation

While it is possible to perform some checks with the boat trailered, the boat should be in the water

to properly test the sonar portion of the installation.

Press the POWER button and the GPSMAP 178/178C should power on. If the unit fails to power

on, verify that the wiring adapter is seated properly in the back of the unit, the Red and Black wires are

connected to the correct polarity, and that the fuse is installed and not blown. If the unit is connected to a

power supply that exceeds 35 VDC, a “Battery Voltage High” warning is displayed and the unit turns off.

Since water is necessary to carry the sounder’s sonar signal, the transducer must be in the water to

work properly. It is not possible to get a depth/distance reading when out of the water. As the unit powers

on, it should immediately start showing the bottom. Verify that the unit is not in the simulator mode. If

the unit is in the simulator mode, make sure that the transducer is connected to the wiring harness.

To test the transducer installation, gradually increase the boat speed while checking the unit opera-

tion. If the unit displays intermittently or fails to display, verify that the transducer is aligned parallel

with the bottom and if necessary, adjust the transducer height until the unit operates correctly. It may be

necessary to make several adjustments to ensure proper operation throughout the speed range.

NOTE: When adjusting the depth of the transducer, make the adjustments in small incre-

ments. Placing the transducer too deep can adversely affect the boat’s performance and

put the transducer at greater risk of striking underwater objects.

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Garmin GPSMAP 178C Sounder Manuel d'utilisateur Page 110