Prepare The Mounting Location - Humminbird XNT 9 20 Installation Manual

TRANSDUCER Installation Guide
1
Avoid areas where there is turbulent water flow. Turbulent water is normally confined to areas
immediately aft of ribs, strakes, or rivets on the bottom of the boat, and in the immediate area
of the propeller(s). The best way to locate turbulence-free water is to view the transom while
the boat is moving.
2
Observe your propeller's direction of rotation (in forward, as you're facing the stern of the boat
from behind). Clockwise propellers create more turbulence on the port side. Counterclockwise
propellers create more on the starboard side.
3
Ensure there is adequate distance from the propeller(s). On outboard or inboard/outboard
boats, it is best to locate the transducer at least 15" (38.1 cm) to the side of the propeller(s).
4
The ideal mounting location (right of the propeller[s]). It is important to note that if you plan
to trailer your boat, do not mount the transducer too close to trailer bunks or rollers to avoid
moving or damaging the transducer during loading and unloading of the boat.
5
For boats with stepped hulls, it may be possible to mount the transducer on the step. Do not
mount the transducer on the transom behind a step to avoid popping the transducer out of the
water at higher speeds.
6
The transducer must be mounted so that it is parallel with the waterline, but fully submerged
in the water during operation.
Deadrise: The hydrodynamic shape of your transducer allows the sonar beams to point down
without deadrise adjustment.
1

| Prepare the Mounting Location

1. Confirm the boat is level on the trailer (both from port to starboard and from bow to stern).
2. Hold the mounting bracket against the transom of the boat in the location you have selected.
Align the bracket horizontally, using the level. Make sure that the lower screw hole protrusion
does not protrude past the bottom of the hull.
Refer to the minimum clearance requirement between the bottom of the bracket and the
bottom of the transom for your boat type below:
1/4" (6 mm) clearance for fiberglass boats
1/8" (3 mm) clearance for aluminum boats
NOTE FOR ALUMINUM BOATS: For flat-bottomed aluminum boats, some additional adjustment
may be needed to accommodate the rivets on the bottom of the boat (the gap may need to be a
little smaller than 1/8"). This will help you to avoid excessive turbulence at high speeds.
If your propeller moves clockwise, mount the transducer on the starboard side. If your
propeller moves counterclockwise, mount the transducer on the port side.
3. Continue to hold the bracket on the transom of the boat, and use a pencil or marker to mark
where to drill the two mounting holes. Mark the drill holes near the top of each slot, making
sure that your mark is centered in the slot (see Using the Mounting Bracket to Mark the Initial
Drill Holes).
NOTE: The third hole should not be drilled until the angle and height of the transducer is finalized,
which you will not do until a later procedure.
4. Confirm that the drill bit is perpendicular to the actual surface of the transom, (NOT parallel
to the ground), before you drill. Using a 5/32" (4 mm) bit, drill the two holes only to a depth of
approximately 1" (25.4 mm).
2
532310-3_A
deadrise angle
Using the Mounting Bracket
to Mark the Initial Drill Holes
LEVEL
1/4" for fiberglass
1/8" for aluminum
mark initial drill holes