Humminbird 998c SI - Manual (Page 27)

17 Transom Mount - DualBeam PLUS™
NOTE: It is important to take your measurement in
the figure showing Measuring the Transom
Angle, from exactly 12 inches down from the top
of the transom.
2. Place the two ratchets, one on either
side of the transducer knuckle, so that
the beads on each ratchet line up with
the desired position number on the
knuckle. If you are setting the ratchets
at position 1, the beads on each ratchet
will line up with the rib on the
transducer knuckle to form one
continuous line on the assembly.
NOTE: The ratchets are keyed; make sure that
the square teeth on each ratchet face the
square teeth on the transducer knuckle, and
the triangular teeth face outward.
Hold the ratchets on the transducer knuckle with one hand and fit
the pivot arm over them until it snaps into place with the other
hand. Refer to the illustration.
Transom
Angle in
degrees
(°)
Measured
Distance (X)
Measuring the Transom Angle
Plumb
line
Weight
Transducer Knuckle Positions Ratchets Placed in Position 1
Ratchets Placed in Position 2 Fitting the Pivot Arm Over the Ratchet
Knuckle
Bead
Ratchet
Rib
Rib at
position 1
Beads
Ratchet