Garmin Fishfinder 240 Blue Owner's Manual - Page 12
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Installation
OK
Adjust the speed sensor so it is parallel with the bottom
of the boat. If the speed sensor is not adjusted properly,
the sonar may experience inaccurate or degraded speed
readings.
Drill a 3/4" hole well above the water line.
Coat the inside of the hole with Marine Sealant.
Position Cable Clamps about one-third of
the distance from the hole to the transducer.
Drill 1/8" pilot holes 3/8" deep for the mounting screws.
Coat the screws with Marine Sealant before installing them.