Page 789 records and reports 842 



Mention any nonstandard depth curves used to define special submarine features. 



K. Crosslines. — State the percentage of crosslines run and give discrepancies at crossings in 

 percentages of the depth; a list tabulating each crossing is not required except for surveys controlled 

 by R.A.R. (See 3571 and 7722a.) 



L. Comparison with prior surveys. — Compare the results of the new survey with those of prior 

 surveys in the area, identifying the latter by registry numbers, dates, and scales. (See 3234 and 

 3521.) State the general agreement or disagreement between the new survey and prior surveys; 

 describe, in general, investigations made of any discrepancies found and give conclusions reached as 

 to the reasons for the discrepancies. 



List in tabular form any features or depths on prior surveys whose existence has been disproved, 

 and which should be deleted from the charts. Include in the list bare rocks, as well as subsurface 

 features and depths. 



Discuss the agreement or disagreement in depths at junctions with prior surveys and if an adjust- 

 ment is required, make a recommendation as to how this is to be effected. (See 3132.) 



Compare the new survey with any surveys in the area by the United States Corps of Engineers. 

 Since these are generally not duplicated, the discussion will ordinarily be limited to the agreement or 

 disagreement at the junction. The Engineers surveys should be identified by date, scale, and sheet 

 number and, unless copies are known to be available in the Washington Office, those with which 

 comparison is made should be forwarded with the smooth sheet. 



M. Co?nparison with chart. — Compare the new survey with a copy of the largest-scale chart of 

 the area, identifying the chart by its print date and give similar information, without duplication, to 

 that required for the prior surveys. Dangers, shoals, and wrecks are often charted from sources 

 other than the surveys of the Bureau and it is important that definite recommendations be made as 

 to the disposition of differences between the new survey and the chart. This comparison shall be 

 made, regardless of any difference in scale between the new survey and the chart. If the comparison 

 required in L has been made, most of the charted data will already have been considered. If the 

 comparison required in L has not been made, this comparison with th^ chart shall be complete 

 and detailed. (See 3522.) 



N. Dangers and shoals. — Tabulate and describe the important newly found dangers and shoals, 

 giving the latitude and longitude of each, and the least depth on each with its position number. 



Complete information should be included in the Sounding Record regarding the extent of develop- 

 ment, including the time spent in drift sounding over an area or in watching for breakers. This 

 information should not be repeated in the Descriptive Report except in special cases. (See 3666.) 



Reported uncharted dangers and shoals should be discussed fully giving the depths found and the 

 area covered and time spent in search for any reported danger not found. 



Dangers and shoals found with the wire drag but not cleared should be listed, with the least 

 depth found in each case and additional information as required above. 



List charted dangers or shoals, or those shown on prior surveys on which the least depths are less 

 than those found on the new survey. Discuss each case separately as to the adequacy of the new data 

 and make a recommendation in each case as to whether the previous depth should be retained. (See 

 352 and 363.) 



Mention specifically each danger reported to the United States Coast Guard in accordance 

 with 8522. 



Include a statement that all charted dangers, shoals, and bare rocks were found as charted, or 

 shoaler depths were found except for those listed in L, M, and A''. 



0. Coast pilot information. — Information included under this heading shall be repeated in a special 

 coast pilot report in accordance with 912, or an extra copy should be furnished and marked for the 

 Coast Pilot Section. (See 159.) 



List any areas recommended as anchorages in newly surveyed areas and give the following infor- 

 mation: depth of water; holding quality of the bottom; ranges or bearings for entering or anchoring; 

 protection from wind, sea, and currents; the availability of fresh water; and the extent used by the 

 survey ship and other vessels. 



List the places where the ship or launches anchored while making the survey and give information 

 similar to the above insofar as it is applicable. 



Describe natural channels that can be used for navigation. Give recommended courses and the 

 controlling depth and its location in each, according to the new survey. Give controlling depths and 

 their locations in all artificial channels. Recommend courses for navigating any part of the area for 

 which this information is available. 



