5. HYDROGRAPHY 



169 



Sublocality 



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Figure 66. — Record of echo soundings with sextant angle control. (Double page of sounding record reduced 



about one-half.) 



lead soundings are interspersed, each hand 

 lead sounding shall be identified by the 

 letters "HL." Similarly, pole soundings shall 

 be identified by the letter "P," and wire 

 soundings by the letters "VC" (vertical cast). 

 Soundings by leadline, pole, or wire must 

 not be recorded unless they are true vertical 



measurements of the depth. Slope measure- 

 ments occur most frequently when a wire 

 sounding machine is being used to obtain 

 bottom samples. 



The character of the bottom shall be en- 

 tered in the first column on the right-hand 

 page using the abbreviations listed in 5-88. 



