D. G. Tucker 
~ RIDGE ON 
SEA BOTTOM 
800 yds ~ 
Fig. 2.8. Scanning sonar display with horizontal beam, showing ridge 
on sea bottom, (Shallow coastal waters, Southern England.) 
Gs us ae 10 fm. 
4 
7 
7 
7 
Fig. 2.9. Scanning echo-sounder 
display, showing bottom slope of 
approximately 45° on Continental 
slope, Eastern Atlantic. (Courtesy, 
Institute of Navigation, London.) 
7° 240 fm. 
4 
39 
