244 



HYDROGRAPHIC MANUAL 



elude the size of the areas, apparent thick- 

 ness, and reference to typical profiles by date 

 and day letter. Unusual submarine features 

 such as mounds, valleys, and escarpments 

 should be described. If special reports have 

 been submitted on such subjects, they should 

 be referred to by title and author. 



P. Recommendations. — If any part of the 

 survey is considered inadequate for charting, 

 submit a recommendation as to additional 

 field work required and the methods to be 

 used. Include recommendations for further 

 investigation of unusual features or sea con- 

 ditions of interest and in excess of charting 

 requirements. 



Q. References to reports. — List all re- 

 ports, records, and forms not included in the 

 descriptive report or records of the survey 

 which are necessary for a complete evalua- 

 tion and understanding of the survey rec- 

 ords, and which have been submitted sep- 

 arately. Give the title of the report and the 

 date on which it was forwarded to the 

 Washington Office. 



7-5 Separates following text. — Various 

 tabulations and kinds of information are re- 

 quired on separate sheets of paper inserted 

 in the descriptive report. Each of these that 

 is applicable shall be furnished and inserted 

 in the order in which it is described in the 

 following sections. 



Beginning with the first page of the text, 

 it and the attached inserts shall be numbered 

 consecutively, ending with the approval 

 sheet which is always placed last. 



Other forms and reports will be added to 

 the report in the Washington Office when 

 the smooth sheet is verified and reviewed. 

 Therefore, the report should be secured in 

 the cover \vith removable staples. 



7-6 Tide note. — A tide note shall be at- 

 tached to the descriptive report for each 

 hydrographic survey. The location, includ- 

 ing the latitude and longitude, of each tide 

 station used or tidal zone established for re- 

 duction of soundings plotted on the sheet 

 shall be given. If more than one station was 

 used, the tide note shall define the limits of 

 the area in which each was used. The note 



shall state the height on the tide staff at 

 each station corresponding to the plane of 

 reference and whether any corrections for 

 differences in time or height were applied 

 to the observed tides. If the hourly heights 

 were furnished from the Washington Office 

 the tide note should so state. The time 

 meridian used at each tide station shall be 

 stated. 



7-7 Geographic name list. — An alpha- 

 betical list of all geographic names penciled 

 on the smooth sheet shall be prepared sep- 

 arately and inserted in the descriptive re- 

 port. No other information should be in- 

 cluded with this list except a reference to 

 special reports on geographic names (see 

 2-42). 



7-8 Abstract of corrections to echo sound- 

 ings. — An abstract, in tabular form, of the 

 velocity corrections which are applied to 

 echo soundings shall be included as a sep- 

 arate entry in the descriptive report. A ref- 

 erence should be made to the special report 

 on corrections to echo soundings submitted 

 for the project. The abstract shall show the 

 dates, vessels, and instruments to which the 

 corrections apply. If the same corrections 

 apply to more than one survey, a copy of 

 the abstract shall be included in the descrip- 

 tive report for each survey. 



7-9 Abstract of corrections to distance 

 measurements. — When all or part of the sur- 

 vey is controlled by an electronic distance 

 measuring system, an abstract of corrections 

 applied to the measured distances shall be 

 inserted in the descriptive report. The dates, 

 vessels, and equipment to which the correc- 

 tions apply shall be clearly shown. Carbon 

 copies of applicable tables in the special re- 

 port on the same subject are adequate for 

 this purpose. 



7-10 List of signals. — An alphabetical 

 list of stations (signals) used on the survey 

 shall be typed on a separate sheet and in- 

 serted in the descriptive report. The list 

 shall show the name as used in the hydro- 

 graphic survey and the authority for the 



