Garmin GPSMAP 420 Owner's Manual page 50

I u
nStallInG the nIt
Mounting the Transducer on a Transom
Mount the transducer parallel with the bottom.
44
Apply marine sealant to all
screw threads to prevent water
from seeping into the transom.
OK
USS Barnett
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 the transducer directly in the
path of the prop. The transducer can cause
cavitation that may degrade the boat's
performance and damage the prop.
GPSMAP 400 Series Owner's Manual
®