Selecting The Best Location - Interphase Advantage User Manual

Thru-Hull Transducer Installation
The thru-hull transducer is the recommended choice for
larger boats with in-board engines. Thru-hull mounting is
usually required on larger power and sail craft. The
Advantage must have a clear view of the water below as
it can not magically see through obstructions such as the
vessel's hull. Please read the following carefully before
starting the thru-hull installation.
Normally, thru-hull installations are performed by a
professional in a boat haul-out facility and you may want
to seek professional assistance before attempting to mount
this transducer.

Selecting the Best Location

The best location to mount the thru-hull transducer will
vary with the type of boat. Try to find a location with the
smallest dead rise angle to make installation easiest.
Consider that from time to time you will need to
remove the speed/temperature plug (from within the
vessel) in order to clean the speed paddle wheel. Make
sure you choose a location that is easily accessible
from inside the vessel!
a. On displacement hulls (sailboats, trawlers, etc.) locate
the transducer about 1/3 aft along the waterline.
Generally this provides the best compromise between
obtaining aeration-free water and minimizing propeller
noise. The Advantage's transducer can not see through
aerated water and water near the bow and near the keel
can be quite aerated. Aeration of the transducer can be
minimized by keeping the transducer mounted away from
the keel and by not mounting too far forward.
b. On sailboats, the transducer should be mounted where
the acoustic beam will not be shaded by the keel. Try to
find an accessible spot with a minimum dead rise angle.
c. On planing powerboat hulls, the transducer should be
mounted well aft and close to the keel to insure that the
transducer is in contact with the water at higher speeds.
On I/O's, transducer mounting close to the
engine usually yields good results.
(Transducer in front of propeller.)
On inboards always mount the transducer
well ahead of the propeller(s). Turbulence
from props can seriously degrade perform-
ance.
(Thru-hull installation is recommended.)
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