8111 



HYDKOGRAPHIC MANUAL 



Page 758 



8111. Standard Abbreviations 



Because of the vast amount of recording and the speed wliich is often required, 

 abbreviations for many of the terms and expressions which are used repeatedly are 

 advantageous. The list which appears here is to be considered standard. This does 

 not preclude the use of common well-known abbreviations which may not be included. 

 If the need arises for an unusual abbreviation for a term used repeatedly, but not 

 included in the list, it should be explained in the front of sounding volume No. 1 of each 

 sheet for which it is used. 



Abbreviations for bottom characteristics are given in part "S" of the Symbols and 

 Abbreviations chart (fig. 189). 



abbreviation 



term 



no bottom (at 18) 



©e. 



18 



< angle 



O station 



fin range 

 [or on range 



ah ahead 



B. S. boat sheet 



c/c changed course 



cor correction 



dist distance 



D. R. dead reckoning 



fath _ _ fathometer 



to fathom 



F. S full speed 



H. L. handlead 



H. S half speed 



hyd hydrography 



L< left angle 



Lat. or * latitude 



L. B.-- line begins 



L. E line ends 



L. L. .-_ leadline 



Long, or X longitude 



L. T line turns 



L. T. L line turns left 



abbreviation term 



L.T. R. line turns right 



M missed sounding 



N. G. no good 



N. P not plotted 



N. R no return (R.A.R.) 



obj object 



o/c — on course 



Pos position 



p. s. c per standard compass 



B. _ rejected 



R< , right angle 



R.A.R Radio Acoustic Ranging 



R. C. .. revolution counter 



r. p. m. revolutions per minute 



S -- same 



sdg sounding 



SI. S slow speed 



S. R. B sono-radio buoy 



st _. stop 



stbd starboard 



St. S standard speed 



T true (bearing) 



T. W Taut wire 



V. C. vertical cast 



W. D. wire drag 



812. Page Headings 



The appropriate entries shall be made in full in the spaces at the top of the first 

 and last record page of a day's work and, if it is divided between two volumes, on the 

 last page of the fu'st and the first page of the second volume. The entries should be 

 made on each page if this does not preclude the proper recording of more vital informa- 

 tion. A dathig stamp and rubber stamps with the vessel's name and the general locality' 

 may be used to enter these data after the completion of the day's work, but under 

 no circumstances should such information be stamped on pages in advance of the 

 recording. 



8121. Day Letter 



For proper identification, each day's work of each vessel shall be assigned a letter 

 in alphabetical order (beginning with the letter A and omitting / and 0), such letter 

 to be entered in color in the appropriate space at the top of each record page. The 

 survey ship and each smaller unit shall have a separate series, distinguishing them by 

 using capital letters of one color for the ship and lower-case letters and a different color 

 for each other vessel — these distinctions to be preserved in the records and on the sheets. 

 Two small boats used by the same hydrogi-aphic survey unit on the same day need not 

 be distinguished. See 3311 for special cases when sounding is continued past midnight. 



