Garmin GPSMAP 188 Owner's Manual And Reference Manual

Also see for GPSMAP 188 Sounder: Declaration of conformity Declaration of conformity Owner's manual Specifications

Contents

Garmin GPSMAP 188 Owner's Manual And Reference Manual Manual pdf 109 page image

99Appendix ATesting the InstallationTesting the InstallationWhile it is possible to perform some checks with the boat trailered, the boat should be in the waterto properly test the sonar portion of the installation.Press the POWER button and the GPSMAP 188/188C/238 Sounder should power on. If the unitfails to power on, verify that the wiring adapter is seated properly in the back of the unit, the Red andBlack wires are connected to the correct polarity, and that the fuse is installed and not blown. If theunit is connected to a power supply that exceeds 35 VDC, a “Battery Voltage High” warning will bedisplayed and the unit will turn off.Since water is necessary to carry the sounder’s sonar signal, the transducer must be in the waterto work properly. It is not possible to get a depth/distance reading when out of the water. As theunit powers on, it should immediately start showing the bottom. Verify that the unit is not in thesimulator mode. If the unit is in the simulator mode, make sure that the transducer is connected tothe 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 parallelwith the bottom and if necessary, adjust the transducer height until the unit operates correctly. It maybe 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 smallincrements. Placing the transducer too deep can adversely affect the boat’sperformance and put the transducer at greater risk of striking underwater objects.)