Mounting The Transducer; Transom Mount Installation - Garmin GPSMAP 188 Owner's Manual And Reference Manual

Proper transducer installation is key to getting the best performance from your new unit. If the
transducer lead is too short, extension cables are available from your Garmin dealer. DO NOT cut the
transducer lead or any part of the transducer cable, as this will void your warranty. The cable cannot be
spliced and connected to any existing (Garmin or non-Garmin) transducer cables.
Following are some tips and basic installation instructions for some popular transducers. Detailed
installation instructions are provided in the transducer kits. Some transducers may need to be installed
by a professional marine installer.

Transom Mount Installation

Transom Mount Transducer (depth/temp)
Apply marine sealant to all
screw threads to prevent water
from seeping into the transom.
OK
Mount the transducer parallel with the bottom.
Mount the transducer cable cover
well above the waterline.
Transducer should extend 1/8" below
fiberglass hull or 3/8" below aluminum hull
Make sure that the transducer is
below water level when the boat
is on plane at high speed
Do not mount transducer directly in the
path of the prop. The transducer can cause
cavitation that may degrade the boat's performance
and damage the prop.
Appendix A

Mounting the Transducer

DO NOT mount the transducer behind strakes, struts,
fi ttings, water intake or discharge ports, or anything that
creates air bubbles or causes the water to become turbulent.
It is important that the transducer be in clean (non-turbu-
lent) water for optimal performance.
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