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Humminbird PiranhaMax 190C Manual

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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.
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 mounting bracket 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 (Figure 16). 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 (Figure 17). Using a ruler,
measure the distance from the bottom of
the plumb line to the back of the
transom, then use the chart (Figure 16).
NOTE: It is important to take your measurement
in the location shown in Figure 17, from exactly 12
inches down from the top of the transom.
12”
Transom Angle
in degrees (°)
Measured Distance (X)
Measuring the Transom Angle
Plumb
line
Weight
Figure 17
Figure 16
-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
142531425
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“
Transom Transducer Installation
12
… 18 …


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