Here is a chart to help you get a clear picture of just how big an area your flasher covers at the bottom of the lake. The whole number indicates
DEPTH. The decimals indicate
DIAMETER at varying degrees of (actual) cone angle, from 8 degrees to 20 degrees.
DEPTH8°
9°
12°
19°
20°This chart shows the difference in area of coverage for our various transducers. It is meant to give you a rough idea of what the diameter of the circle, in feet, on the bottom you are seeing at a specific depth. You must keep in mind that these are transducer specifications and, unless you have your gain set at the maximum level, you will actually be looking at a smaller area. This brings up another interesting point. Your gain control acts much like a variable cone angle control. The drawback is that when you turn your gain up high everything in the middle of the cone gets blown up to the point where you can't see what's on the edge anyway.
10'1.4
1.6
2.2 <----- Example
3.4
3.520'2.8
3.2
4.3 <----- Example
6.7
6.930'4.2
4.7
6.3
10.0
10.640'5.6
6.3
8.4
13.4
14.150'7.0
7.9
10.6
16.7
17.6To calculate readings in deeper water, simply take the reading from ten feet and multiply it accordingly.
Example:
In
10' of water, my 12 degree transducer is capable of showing me a circular area on the bottom with a diameter of
2.2'. (See the example notation above in
Green.)
Use this knowledge to calculate to the nearest 10' depth incrament on your flasher. You can also determine smaller incrament using the same approach.
So for 20' of water, just multiply (
2.2' X 2 =
~4.3') This is a pretty easy way of not only knowing how large an area you're covering, but also for determining how much distance is allowable between holed to be drilled on the surface.
I hope this is as helpful to all of you as I think it should be.
For more information visit:
http://vexilar.com/pages/support/support_tips/article_006.php
