Using the Mounting Bracket to Mark the Initial Drill Holes

Fourth Hole

Mark Initial Drill Holes

Third Hole

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.

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.Make sure 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” bit, drill the two holes only to a depth of approximately 1”.

NOTE: On fiberglass hulls, it is best to use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating.

3. Assembling the Transducer and Initial Mounting

In this procedure, you will assemble the transducer using the hardware provided, then mount it and make adjustments to its position without locking it in place.

NOTE: You will initially assemble the transducer and the pivot arm by matching the two ratchets to a numbered position on the transducer knuckle. Further adjustments may be necessary.

1a. If you already know your transom angle, refer to the chart below for the initial position to use to set the ratchets. If your transom is angled at 14 degrees (a common transom angle for many boats) use position 1 for the ratchets. In either case, go to step 2.

or...

Bead Alignment

1

4

2

5

 

 

3

1

4

2

5

3

1

Number

 

 

Transom Angle (°)

 

 

 

 

 

 

 

 

 

 

 

 

 

-2 -1 0

1 2 3

4 5 6

7 8

9

10

11 12

13 14 15

16 17 18

19 20 21

22 23 24

25 26 27

28 29 30

Measured Distance (x)

0.0 cm

1.1cm

2.5 cm

4.3 cm

 

5.9 cm

7.6 cm

9.3cm

11.1cm

12.9cm

14.9cm

16.9cm

0“

1/2“

1“

1 5/8“

2

3/8“

3“

3 5/8“

4 3/8“

5“

5 7/8“

6 5/8“

1b. If you do not know your transom angle, measure it using a plumb line (weighted nylon string or monofilament line) exactly 12 inches long. Hold the top of the plumb line against the top of the transom with your finger, and wait until the line hangs straight down. Using a ruler, measure the distance from the bottom of the plumb line to the back of the transom, then use the chart.

Transom Mount - DualBeam PLUS™

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