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4. INSTALLATION
31
Note 3: For single drive boat, mount on the
starboard side at least 75 mm (3") beyond the
swing radius of the propeller.
Mounting location on single drive boat
Note 4: For twin drive boat, mount between
the drives.
Installation of bracket
1. Cut out the installation template (enclosed
with transducer) along the dotted line.
2. At the selected location, position the tem-
plate, so the arrow at the bottom is aligned
with the bottom edge of the transom. Being
sure the template is parallel to the water-
line, tape it in place.
Positioning the template
Warning: Always wear safety goggles and a
dust mask.
3. Using a 4 mm, #23, or 9/64" bit, drill three
holes 22 mm (7/8") deep at the locations
indicated. To prevent drilling too deeply,
wrap masking tape around the bit 22 mm
(7/8") from the point.
Fiberglass hull: Minimize surface
cracking by chamfering the gelcoat. If a
chamfer bit or countersink bit is not avail-
able, start drilling with a 6mm or 1/4" bit to
a depth of 1 mm (1/16").
4. If you know your transom angle, the
bracket is designed for a standard 13
°
transom angle.
11
°-18° angle: No shim is required. Skip to
step 3 in "Adjusting".
Other angles: The shim is required. Skip to
step 2 of "Adjusting".
If you do not know the transom angle, tem-
porarily attach the bracket and sensor to
the transom to determine if the plastic shim
is needed.
5. Using the three #10 x 1-1/4" self-tapping
screws, temporarily screw the bracket to
the hull. DO NOT tighten the screws com-
pletely at this time. Follow the step 1-4 in
"Attaching the sensor to the bracket",
before proceeding with "Adjusting".
Adjusting
1. Using a straight edge, sight the underside
of the sensor relative to the underside of
the hull. The stern of the sensor should be
1-3 mm (1/16-1/8") below the bow of the
sensor or parallel to the bottom of the hull.
Note: Do not position the bow of the sensor
lower than the stern because aeration will
occur.
2. To adjust the sensor's angle relative to the
hull, use the tapered plastic shim provided.
If the bracket has been temporarily fas-
tened to the transom, remove it. Key the
shim in place on the back of the bracket.
2
°-10° transom angle (stepped transom
and jet boats): Position the shim with the
tapered end down.
19
°-22° transom angle (small aluminum
and fiberglass boats): Position the shim
with the tapered end up.
Sensor position and transom angle
75 mm (3")
minimum beyon
d
swing radius
Align template vertically.
Deadrise ang
le
Slope of hu
ll
parallel to
waterline
Align template arrow with
bottom edge of transom.
11° transom angle
NO SHIM
12°-18° transom angle
NO SHIM
2°-10°
transom
angle
19°-22°
transom
angle
shim with
taper up
shim with
taper down
parallel
parallel
parallel
slight
angle
angle
too stee
p
angle
reversed
YES
NO
NO
YES
YES
YES