Humminbird 858c Installation And Operation Manual page 27

Measuring the Transom Angle
2. Place the two ratchets, one on either
Plumb
line
Transom
Angle in
degrees
(°)
Measured
Weight
Distance (X)
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.
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.
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.
Transducer Knuckle Positions
Ratchets Placed in Position 2
Rib
17
Ratchets Placed in Position 1
Knuckle
Rib at
position 1
Fitting the Pivot Arm Over the Ratchet
Bead
Ratchet
Transom Mount - DualBeam PLUS™
Beads
Ratchet