ridges, trenches, etc., occasionally are dis- 

 covered. Whenever such unusual phenomena 

 are encountered, it is highly desirable that 

 sounding grids be run to further develop the 

 immediate region. 



5-12 Preparation and Shipping of Sounding 

 Data. — Upon completion of a cruise, all smooth 

 track plotting sheets, DRT tracks, and the 

 navigator's work sheets must be sent to the 

 Hydrographic Office for final inspection and 

 incorporation onto compilation sheets. Under 

 no circumstances are these sheets to be folded. 

 They must be rolled or kept flat. These sheets, 

 along with all sounding logs and echograms, 

 must be packed in suitable shipping cases. 

 The ship's name and number, and the cruise 

 name and number, must be marked on the case. 

 The case should be marked "HANDLE WITH 

 CARE" and addressed to: 



The Hydrographer 



U. S. Navy Hydrographic Office 



Washington 25, D. C. 



Attn: Code 5670 



Figure 5-6. A two-ship oceanic sounding grid. 



H. O. 607 



51 



