Vexilar 107 Pro - Manual (Page 24)

24
Once the boat starts to plane, turbulence will develop
behind the transom. If your transducer is poorly mounted,
the unit will lose the bottom at a certain boat speed. This
is due to all of the air bubbles in the turbulent water.
Readjustment of the transducer mounting should solve this
problem.
SHALLOW WATER OPERATION
When the 107 Pro is in the automatic range and gain
modes, it automatically senses the bottom depth and tries
to keep the best view at all times. Although the display may
not show it, the 107 Pro is monitoring basic sonar signals,
such as the bottoms second echo and various target's sig-
nal strengths. This way it can maintain the optimum gain
level, automatically, for you.
In very shallow water (less than 3 feet) the unit can get
"over-welmed". In this condition the unit will show erro-
neous information. The graphic display will become most-
ly black and the digital numbers on the display will read
depths that are much deeper than reality. These depths are
actually multiple echoes of the real bottom. It is important
to use caution when navigating in shallow waters. Use
common sense. Don't rely solely on your depthfinder.
It often helps to turn off the automatic features and man-
ually change the range to the 5 or 10 foot range. Also, turn
the gain level down to the minimum. If the digital depth
reading doesn't seem right, it is probably a multiple of the
correct depth. Use the graphic display as a better reference.