Buffington, Hamilton, and Moore 



the horizontal plane of the submersible and the plane of the sea floor 

 are not even close to being parallel, and the angle being measured 

 is meaningless. 



II II II 1 1 III II niiiiii 



SEA FLOOR 



Fig. 3 - Lateral Aspect. The plane of the submersible is 

 inclined to the sea floor, bow down. The situation obtains 

 regardless of the absolute slope of the sea floor. 



The remedy in this case (Fig. 4) is procedural. A standard part 

 of the slope measuring procedure must include the rotation of the sub- 

 mersible around an axis normal to its basic horizontal plane of sym- 

 metry, while holding the thwartships axis horizontal with the two 

 spots coinciding on the sea floor. Thus, when the submersible is 

 facing upslope, the measured slope will decrease in both a port and 

 starboard direction away from the azimuth of the maximum. The 

 maximum is the true slope. 



85 



