8322 HYDROGRAPHIC MANUAL PaGE 780 



vations that are taken to locate them should be recorded in a separate sounding volume 

 or notebook. This record is often used by personnel who were not associated with 

 the field work, so it is essential that the record be complete, clear, and self-explanatory. 



The observations taken to locate each shore station or buoy station must be clearly 

 identified and the manner of recording should be as specified in this Manual. 



Observations to locate topogi'aphic detail and to determine elevations for draw- 

 ing form lines from the ship, as described in 382, may be recorded in this same volume. 



All data contained therein shall be indexed on the front pages of the volume. 



This volume shall be labeled "Station Locations by Sextant" and shall be num- 

 bered as one of the Sounding Records (see 819) and shall be forwarded with them as 

 part of the permanent records of the sm'vey. 



8322. Buoy Locations 



All of the computations to determine the positions of buoy stations by oV^sor- 

 vations on shore stations shall be bound together in one folder and plainly identified 

 on the outside. An abstract of all computations involved in determining the position 

 of each buoy station shall be made and placed in the front of the folder. Each sheet of 



computations should be headed "For location of station " and these, 



together with the position computations, should be assembled together in the folder. 



A written report need not accompany the records of buoy locations, unless some 

 new method is used which requires an explanation. Wlien this is deemed advisable 

 by the hydrographer, a short typewritten report should be prepared and placed in the 

 folder with the abstract of computations. 



The observations to locate buoy stations are recorded in a separate soim.ding 

 volume or notebook (see 8321) and this is transmitted with a Sounding Records — 

 not with these computations. 



The folder should contain, for each buoy station located, computations on at 

 least the first three and sometimes on all of the following forms: 



Computation of Three-Point Problem, Form 655. 



Computation of Triangles, Form 25. 



Position Computation, Third-Order Triangulation, Form 27. 



Reduction to Center, Form 382. 



Inverse Position Computation, Form 662. 



Azimuth by Inclined Angle, Form 720. 



Where observations to locate buoys are made at shore stations, they should be 

 recorded in Form 250, Observations of Horizontal Angles, or in Form 251, Observations 

 of Horizontal Directions, and this record should be transmitted with the computations. 



8323. Buoy Traverses 



Where buoy stations are located by traverse— by taut-wii^e or log distances — 

 numerous records and computations are required to determine the final positions. 

 For transmittal to the Washington Office these records and computations shall be 

 bound in three separate folders, each being appropriately identified on the outside, 

 which shall contain the following: 



{Abstract of Buoys Planted, Form 714. 

 Taut- Wire Traverse Observations, Form 777. 

 Log runs to measure distances (recorded on Form 777). 



