Garmin 240 用户手册

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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 1/3rd of the water depth. 
As shown in Example 1, the coverage area at a 30 foot depth is approxi-
mately 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'

4"

10"

15"

20"

25"

30"

35"

40"

45"

45"

3'

6'

9'

12'

15'

18'

21'

24'

27'

30'

190-00155-10 Rev A.indd

08/16/00, 2:47 PM

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