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...
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.
NOTE:
It is important to take your measurement in the
location shown in the illustration
Measuring the Transom
Angle
, from exactly 12 inches down from the top of the
transom.
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.
-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
Transom Angle (°)
Bead Alignment
Number
1
4
2
5
3
1
4
2
5
25 26 27
3
28 29 30
1
Measured Distance (x)
1.1cm
1/2“
0.0 cm
0“
2.5 cm
1“
4.3 cm
1 5/8“
5.9 cm
2 3/8“
7.6 cm
3“
9.3cm
3 5/8“
11.1cm
4 3/8“
12.9cm
5“
14.9cm
5 7/8“
16.9cm
6 5/8“
12”
Transom
Angle in
degrees
(°)
Measured
Distance (X)
Measuring the Transom Angle
Plumb
line
Weight
11
