30
DSM300 Installation Manual
To ensure accurate readings, DO NOT mount the transducer in an
area of turbulence or bubbles:
• near water intake or discharge openings
• behind strakes, fittings or hull irregularities
• behind eroding paint (an indication of turbulence)
Choose a location where:
• The water flowing across the hull is smoothest with a minimum of turbulence
and bubbles (especially at high speeds).
• The transducer will be continuously covered by water when the boat is mov-
ing. If the transducer is mounted near the side of the boat, it may be exposed
when the boat is turning.
• The transducer beam is unobstructed by the keel or propeller shaft.
• There is a minimum deadrise angle.
• There is adequate headroom inside the vessel for the height of the thru-hull
housing, tightening the nuts, and removing the valve assembly insert.
Transom Mount Transducer
• Single drive boat – Refer to Figure 2-3 . If your boat has one propeller (out-
board or inboard), mount the transducer about 18" (455 mm) to the side of
the boat’s centerline. To reduce any interference caused by air bubbles,
choose the side on the downstroke of the propeller (usually the starboard
side).
• Twin drive boat – If your boat has twin propellers (outboard or inboard-out-
board), mount the transducer between the drives near the centerline of the
boat. If the boat will be operated at high speeds, the transducer may be
mounted closer to the centerline of the hull.
• If the propeller can be turned to steer the boat, allow at least 2" (50 mm)
beyond the swing radius of the propeller. This will prevent the propeller from
damaging the transducer when it is turned.
