Table T20. Area insonified.
Traveltime
increment
(ms)
Distance
increment
(m)
Angular
deviation
(°)
Diameter of
return area
(m)
Area of return
(m2)
5 3.75 7.1 1,074 905,782
10 7.50 7.5 1,132 1,005,989
15 11.25 7.9 1,187 1,106,109
20 15.00 8.3 1,240 1,206,141
25 18.75 8.6 1,290 1,306,087
30 22.50 8.9 1,338 1,405,946
35 26.25 9.2 1,385 1,505,717
40 30.00 9.5 1,430 1,605,401
45 33.75 9.8 1,474 1,704,999
50 37.50 10.1 1,516 1,804,509