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104
Appendix H
Transducer Coverage
Transducer Coverage
The area covered by the transmitted sound waves is determined by the cone angle of the transducer
and the water depth. Using GARMIN’s standard 20° transducer, the coverage is approximately 1/3 of the
water depth. As shown is Example 1, the coverage area at a 30-foot depth is approximately a 10-foot
diameter circle. The scale below illustrates how coverage increases as depth increases.
1'
10'
9'
8'
7'
6'
5'
4'
3'
2'
3'
6'
9'
12'
15'
18'
21'
24'
27'
30'
Example 1.
Coverage Diameter
Depth
4"
10"
15"
20"
25"
30"
35"
40"
45"
45"
3'
6'
9'
12'
15'
18'
21'
24'
27'
30'
8° Transducer Coverage Chart
Coverage
Diameter
Depth
168 Manual Part 2.indd 104 11/18/2002, 3:38:17 PM