Garmin GPSMAP 168 Sounder - Manual (Page 111)

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Appendix G
Testing the Installation
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 installation.
Press the POWER button and the GPSMAP 168 Sounder 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 2-Amp fuse is installed and not blown. If the
unit is connected to a power supply that exceeds 18 VDC, a “Battery Voltage High” warning will be
displayed and the unit will turn off.
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
operation. 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.
When adjusting the depth of the transducer, make the adjustments in small increments.
Placing the transducer too deep can adversely affect the boat’s performance and put
the transducer at greater risk of striking underwater objects. )
168 Manual Part 2.indd 100 11/18/2002, 3:38:16 PM