Transom Mounts
The most common place to mount your transducer
is on the transom. It may be helpful to drive your boat
at a variety of speeds and observe wher the water flows
most smoothly off the transom. Smooth, clean water
often flows from the center of the transom at the base
of a step. The transducer is designed to mount slightly
below the bottom of the boat. The metal brackets have
a slot that allows you to make vertical adjustment to the
mounting.
Performance Considerations
Various transducer mount methods depend on your
boat’s performance. If the bulk of your trolling is at 7
MPH or less, mouting the transducer in almoust any
loaction along the bottom of the boat is acceptable. It
is not recommended that you use the bottom following
option at speeds greater than 10 MPH. If you would like
to use the bottom monitoring mode on your Digi-Troll IV
at higher speeds, a mouting position low and toward the
center of the transom is a must. Mounting suggestions
for low and high speed performance are given below.
Regardless of the operating speed you prefer,
always remember the face of the transducer should be
mounted parallel with the water if at all possible.
In most cases, we recommend the transducer be
centrally located with the nose between 1/8” and 1/4”
below the hull. If the boat has only a slightly “v”ed hull
(15 degrees or less), the transducer should be mounted
parallel with the water. (See Figure 1, Option 2)
The deeper the transducer’s pointed end is below
the hull and the more centrally located the transducer is,
the better your unit will operate.
NOTE:
If you have an aluminum boat avoid placing the
transducer behind a row of rivets.
NOTE:
Water turbulence is minimized when the trans-
ducer face is mounted below the bottom of your craft.
Option 1 Mounting - High Speed Operation
In high speed operation, drag and rooster tails can
result from mounting the transducer to low. Also water
flowing to high performance engines becomes more
turbulent. Mounting the transducer as in Option 1 (See
Figure 1) will minimize the turbulence and give better
high speed results.
CAUTION:
Never drag a weight at high speeds.
Use the monitor mode on the Digi-Troll IV if you wish.
Option 2 Mounting - Low Speed Operation
In low speed operation, the transducer can be posi-
tioned to show what is directly under the boat. However,
it may increase drag and possibly throw a rooster tail
when you plane the boat. If you choose Option 2, make
sure the angle of the boat’s hull stays within the lines
marked on the template. (See Figure 2) It may be nec-
essary to angle the transducer somewhat to stay within
the dotted lines.
FIGURE 1
Option 1
Option 2
WRONG
RIGHT
TEMPLATE
FIGURE 2
DEADRISE IS MORE THAN 15º
Mounting Height
Lower
•
Better for aluminum boats with rivets in the hull
•
Better for high speeds
Higher
•
Less boat drag and no rooster tails
•
Less chance of transducer damage
