Furuno GP-1871F Installation Manual Download

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1. INSTALLATION

19°-22° transom angle (small aluminum and fiberglass boats)

: Position the

shim with the tapered end up.

3. If the bracket has been temporarily fastened to the transom, remove it. Apply a

marine sealant to the threads of the three #10 x 1-1/4” self-tapping screws to pre-
vent water seeping into the transom. Screw the bracket to the hull. Do not tighten
the screws completely at this time.

4. Repeat step 1 to ensure that the angle

of the sensor is correct.

Note:

Do not position the sensor farther

into the water than necessary to avoid
increasing drag, spray, and water noise
and reducing boat speed.

5. Using the vertical adjustment space on

the bracket slots, slide the sensor up or
down to provide a projection of 3 mm (1/
8”). Tighten the screws.

How to attach the sensor to the bracket

1. If the retaining cover near the top of the

bracket is closed, open it by depressing
the latch and rotating the cover down-
ward.

2. Insert the sensor's pivot arms into the slots

near the top of the bracket.

3. Maintain pressure until the pivot arms click

into place.

4. Rotate the sensor downward until the bottom

snaps into the bracket.

5. Close the retaining cover to prevent the

accidental release of the sensor when your
boat is underway.

How to route the cable

Route the sensor cable over the transom, through a drain hole, or through a new hole
drilled in the
transom above the waterline.

Never cut the cable or remote the connector; this will void the warranty. Always wear
safety goggles and a dust mask.

1. If a hole must be drilled, choose a location well above the waterline. Check for

obstructions such as trim tabs, pumps, or wiring inside the hull. Mark the location
with a pencil. Drill a hole through the transom using a 19 mm or 3/4” bit (to
accommodate the connector).

2. Route the cable over or through the transom.

Cable cover

Cable
clamp

50 mm (2")

Hull projection 3 mm (1/8")

Step 1

Step 2

Step 3

Step 4

Latch

Pivot
arm

Slot

Retaining
cover

1. INSTALLATION

3. On the outside of the hull secure the cable against the transom using the cable

clamps. Position a cable clamp 50 mm (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 transom

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 3 mm or 1/8” bit to drill a hole 10 mm

(3/8”) deep. The prevent drilling too deeply, wrap masking tape around the bit 10
mm (3/8”) from the point.

7. Apply marine sealant to the threads of the #6

1/2” self-tapping screw 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 display unit being careful not to tear the cable jacket when

passing it though the bulkhead(s) and other parts of the boat. To reduce electrical
interference, separate the sensor cable from other electrical wiring and "noise"
sources. Coil any excess cable and secure it in place with zip-ties to prevent
damage.

1.3.5

Matching box (required for 50/200-1T transducer)

The matching box (Available as an optional extra. Type: MB-1100, Code No.: 000-
041-353) is required to connect the optional 50/200-1T transducer.

*: With 10P connector cable

**: For connecting two transducers

Part

Type

Code no.

Qty

Matching Box*

MB-1100

000-041-353