168 



HYDROGRAPHIC MANUAL 



Dalr_ 



Locality 



S. E. ALASKA 

 AUG 10 1958 



Sublocality 



CLARENCE STRAIT 

 LAUNCH 176 



.. -P 



day 



Figure 65. — Record of echo soundings with Shoran control and entries properly made. (Double page of 



sounding record reduced about one-half.) 



There is no objection to changing from 

 one unit to another in the sounding record, 

 but where such change is made, it must be 

 clearly indicated. Since only one unit is used 

 on one hydrographic sheet, it is more con- 

 venient to record soundings in the unit to 

 be used in plotting where practicable, and 



that changes from one unit to another be held 

 to a minimum consistent with the accuracy 

 required (see 5-63). 



When soundings are obtained simultane- 

 ously by two instruments, the source of each 

 must be shown. For example, if most sound- 

 ings are scaled from a fathogram and hand 



