Vexilar LC-507 - Manual (Page 24)

24
HIGH SPEED OPERATION
The LC-507 can read depths at almost any boat speed. Due to
the limited speed of the LCD display, the displayed bottom may be
some distance behind you, depending on how fast the boat is trav-
eling and the currently selected Sweep Speed. Use the A-Mode fea-
ture to help you with high speed readings. Here, high speed is
defined as any speed at or above the speed at which the boat planes
out.
The LC-507 has a Super Fast Sweep Speed setting. This maxi-
mum Sweep Speed should be used when the boat is traveling at
higher speeds. The faster sounding rate will greatly help in the iden-
tification of fish and structure under the high speed conditions.
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 bub-
bles in the turbulent water. Readjustment of the transducer mount-
ing should solve this problem. In general, you will have better high
speed readings with the 400 kHz beam than you will with the 107
kHz beam.
SHALLOW WATER
OPERATION
When the LC-507 is in
the automatic range and
gain modes, it automati-
cally senses the bottom
depth and tries to keep
the best view at all times.
Although the display
may not show it, the LC-
507 is monitoring basic
sonar signals, such as the bottoms second echo and various target's
signal 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-
Figure 28