^842 HYDROGRAPHIC MANUAL PaGE 788 



Include any remarks about the progress of the work, explaining especially the reason for any 

 unsatisfactory progress. 



C. Vessel and equipment. — Identify the vessel or vessels actually used in the survey and give 

 the general area in which each operated. If the survey was made from launches, state whether they 

 operated from the ship, from a camp, or from a shore base, giving the locality or localities of the latter. 



Give the turning radius of each vessel at the speeds at which each was operated during hydrog- 

 raphy in accordance with 3463. 



Identify by types and serial numbers all echo-sounding instruments used, give the type of other 

 sounding equipment used, and the general area or depths in which each was used. 



D. Tide and current stations. — Give the location of the tide station and any time or range correc- 

 tions which were applied to the tidal data in reducing the soundings. If more than one tide station 

 was used, identify specifically the parts of the survey to which each applies. 



List the current stations if any were occupied. 



E. Smooth sheet.^StSite where and how the projection was made, whether by hand or by ruling 

 machine, and how the shoreline and signals were transferred if unusual methods were used, as for 

 example, those described in 7331 and 7334. 



State whether the transfer of shoreline and topographic details has been verified in accordance 

 with 757. 



F. Control stations. — Give the source of the control for triangulation stations; give the name of 

 the Chief of Party, and the year of location. For topographic stations give the registry numbers 

 and years of the topographic sheets from which the positions of the stations were taken, identifying 

 the method used on each; that is, planetable, air photographic, or graphic control. 



Where survey buoys were used for control, explain in detail t4ie method used to locate them unless 

 a special report has been made (see 832), in which case a mere mention of the method of control and a 

 reference to the report will suffice. 



Explain in detail any special or unusual methods used to locate any control stations, identifying 

 them by name. If the positions of the control stations in any part of the area are less accurate than 

 in other parts, or if any specific stations are less accurate, identify these by area or by name, giving 

 the reason for the deficiency and a statement as to what effect this may be expected to have on the 

 position accuracy of the soundings. 



G. Shoreline and topography. — Give the source of the shoreline and topographic details, identi- 

 fying topographic surveys by number and year. If any of the shoreline or topographic details were 

 found to be inaccurate or to have changed since the original survey and were revised by the hydrog- 

 rapher, identify specifically the parts revised, giving reasons for revision and complete details of the 

 methods used. (See 381 and 753.) 



Any discrepancies between the topographic and hydrographic surveys which had to be adjusted 

 should be explained in detail in accordance with 7827. 



If the survey is of an area where there is no prior topographic survey and the hydrographic party 

 furnishes these details, a statement should be made as to their accuracy and the methods used, and 

 whether they are adequate for charting (see 3812). 



If the low-water line is not defined by the soundings, describe the conditions that prevented this. 

 (See 3122.) 



H. Soundings. — State the methods by which the depths were measured, describing in detail 

 any unusual methods or equipment and any unusual corrections that were applied to the recorded 

 depths. 



I. Control of hydrography. — State the methods of horizontal control used and define the dif- 

 ferent areas in which each was used. Explain in detail any unusual or substandard methods. If 

 any part of the work had to be adjusted in horizontal position give the reason and the method of 

 adjustment used. 



If R.A.R. control was used explain in detail the method of determining the velocities used and the 

 method of plotting, unless this is included in a special report (8333) to which reference may be made. 



J. Adequacy of survey. — State whether the survey is complete, and whether it is adequate to 

 supersede prior surveys for charting. Identify any part of the survey that is' incomplete and state in 

 detail what is required for completion. Identify any part of the survey that is less reliable than the 

 remainder or that fails to comply strictly with the requirements of the Hydrographic Manual or of 

 the project instructions, giving the reasons in each case. 



State whether the junctions with the adjoining surveys are satisfactory or whether holidays or 

 excessive differences exist. State also whether the depth curves can be adequately drawn at the 

 junctions. 



