4. If the performance improves while turning to the side on which
the multisensor is installed, its position probably needs
adjustment. The multisensor is probably in aerated water.
To improve performance
, try the following
one at a time
in the
order given.
A. Increase the multisensor’s angle in the water. Review “Plastic
Shims” and see Figure 5.
B. Move the multisensor farther into the water in increments of
3mm (1/8") (see Figure 4).
C. Move the multisensor closer to the centerline of the boat.
Fill unused screw holes with marine sealant.
Stabilizing the Bracket
Stabilize the bracket by installing the third bracket screw at the
bottom of the center slot (see Figure 6). Using a 4mm, #23, or 9/64"
drill bit, drill a hole 22mm (7/8") deep. To prevent drilling too deeply,
wrap masking tape around the bit 22mm (7/8") from the point.
Fiberglass hull
—Minimize surface cracking by running the drill in
reverse until the gelcoat is penetrated.
Apply marine sealant to the threads of the third #10 x 1-1/4" self-
tapping screw to prevent water seepage into the transom. Tighten
the screw.
Cable Routing
Route the multisensor cable over the transom, through a drain hole,
or through a new hole drilled in the transom
above the waterline
.
Caution
: Never cut the cable or remove the connector; this will
void the warranty.
Warning
: Always wear safety goggles and a dust mask.
1. If a hole must be drilled through the transom, choose a location
well above the waterline
(see
Figure 4). Check for obstructions
such as trim tabs, pumps, or wiring inside the hull. Mark the
location with a pencil. Drill a hole using the appropriate size bit
to accommodate the connector.
2. Route the cable over or through the transom.
3. On the outside of the hull, secure the cable against the transom
using the cable clamps. Position one cable clamp 50mm (2")
above the bracket and mark the mounting hole with a pencil.
4. Position the second cable clamp halfway between the first
clamp and the cable hole. Mark this mounting hole.
5. If a hole has been drilled in the transom, open the appropriate
slot in the cable cover. Position the cover over the cable where it
enters the hull. Mark the two mounting holes.
6. At each of the marked locations, use a 3mm or 1/8" bit to drill a
hole 10mm (3/8") deep. To prevent drilling too deeply, wrap
masking tape around the bit 10mm (3/8") from the point.
7. Apply marine sealant to the threads of the #6 x 1/2" self-tapping
screws to prevent water from seeping into the transom. If you
have drilled a hole through the transom, apply marine sealant to
the space around the cable where it passes through the
transom.
8. Position the two cable clamps and fasten them in place. If used,
push the cable cover over the cable and screw it in place.
9. Route the cable to the instrument
being careful
not to tear the
cable jacket when passing it through the bulkhead(s) and other
parts of the boat. To reduce electrical interference, separate the
sensor cable from other electrical wiring and the engine(s). Coil
any excess cable and secure it in place with zip-ties to prevent
damage.
10.Refer to your echosounder owner’s manual to connect the
multisensor to the instrument.
3
Figure 6. Stabilizing the bracket
AIRMAR
®
13
°
transom angle
14
°
–17
°
angle
Figure 5. Multisensor angle adjustment
20
°
transom angle
3
°
transom angle
parallel
slight angle
4.5
°
shim
4.5
°
shim
with taper
with taper up
angle
slight angle
AIRMAR
®
9
°
shim
with taper
nearly parallel
May improve operation
above 20kn (23MPH)
May improve operation
above 20kn (23MPH)
more angle
9
°
and 4.5
°
shims with
more angle
May improve operation
above 20kn (23MPH)
down
tapers down
down
May improve operation
above 20kn (23MPH)
4.5
°
shim
with taper
down
more angle
