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much more powerful than a wide beam transducer. This is
because you are putting that same amount of power into a
smaller area. This can be an advantage if you are fishing in
deep water or a detriment if you are fishing shallow. A nar-
row beam transducer can be overpowering in shallow water.
The FL-10 In-Dash comes standard with the 12 degree
angle. This beam angle that works well in most applications.
You can purchase optional transducers, for more specialized
applications, with different beam angles.
Transducer Area of Coverage vs Depth
Actual shape
of beam
This chart indicates the transducer's theoretical beam angle. What
you actually see on the display of your depth finder depends on factors
such as target size, reflectivity, and gain level.
Depth 9º
10'
20'
30'
40'
Theoretical
50'
Beam Angle
(-3dB Point)
60'
70' 11.0' 14.7' 23.4'
80' 12.6' 16.8' 26.8'
90' 14.2' 20.0' 30.1'
100' 15.7' 21.0' 33.5'
120' 18.9' 25.2' 40.2'
150' 23.6' 31.5' 50.2'
200' 31.4' 42.0' 67.0'
19
19º
12º
1.6' 2.2' 3.4'
3.2' 4.3' 6.7'
4.7' 6.3' 10.0'
6.3' 8.4' 13.4'
7.9' 10.6' 16.7'
9.4' 12.6' 20.8'
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