5. HYDROGRAPHY 



167 



Subloeality 



NORTH OF PT. SUR CALIF 

 PIONEER 



Jj^day 



Figure 64. — Record of echo soundings, sextant fixes and Raydist control, showing application of rules for 

 entering corrections. (Double pag^e of sounding record reduced about one-half.) 



need be recorded at odd intervals, a sounding 

 may be entered on each line except the line 

 following a position. Where the bottom is 

 irregular and many extra soundings are 

 scaled from the fathogram, the soundings at 

 regular intervals shall be entered on alter- 

 nate lines. 



Soundings shall be entered in fathoms and 

 decimals, or feet and decimals (see 1-38 and 

 Table 2). No sounding shall be entered in 

 fathoms and feet, and fractions shall not be 

 used. The depth unit shall be indicated by 

 a line through the inapplicable subheading 

 at the top of the double column. 



