9347 HYDROGRAPHIC MANUAL PaGE 858 



review, after the review has been signed, must be initialed and dated. If these notations, 

 or any alterations made on the smooth sheet, are of sufficient importance to affect 

 charting and the survey has been applied to the chart, special notification must be made 

 to the Nautical Chart Branch. 



9347. Matters Left in Abeyance 



It is not always possible to dispose of all matters at the time a review is made, as 

 for example, where an item must be referred to the field party for a recommendation. A 

 book entitled "Matters to be Disposed of" is kept in the Surveys Branch, in which must 

 be entered all matters left open on reviewed surveys which require some positive future 

 action. All entries must be clear and explicit, and be in sufficient detail to make the 

 meanmg obvious without further study. Such entries should always be headed by the 

 registry numbers of the affected surveys, diagram number, initials of the reviewer, and 

 date. Each reviewer shall be responsible for following up and disposing of his own 

 entries. 



• 9348. Written Report 



The main purpose of the written review of a hydrographic survey is to state briefly 

 and concisely, as a matter of permanent record, the pertinent facts relating to the sur- 

 vey. The review should serve as a guide to the chart compiler and as a basis for instruc- 

 tions for future additional field work. It should embody such important parts of the 

 verifier's criticism as are found justified and should be made a matter of record, and 

 shoidd consider the broader phases of the survey, such as: 



(a) The adequacy and sufficiency of the results of the field operations, for charting 

 or other purposes. 



(6) The results of comparative studies of old and new surveys to determine whether 

 inconsistencies are the result of inaccuracies, or changes of artificial or natural origin. 



(c) The investigation of charted shoals and other dangers to navigation in the light 

 of the new survey for the purpose of determining which can be superseded and which 

 should be retained. 



(d) Suggestions for improvements in field and office methods, based on the 

 reviewer's broad experience with many types of surveys. 



Based on the review made, the written report should follow as closely as practicable 

 the following outline: 



A. Shoreline and signals. — The origin of the shoreline and oft"-l3nng topogi'aphic 

 features and of the positions of the control stations shall be given. A cross-reference 

 will be sufficient, where this information is included in the Descriptive Report (see 842F 

 and G). 



B. Differences of depths at crossings. — Include the result of 9342a. 



C. Depth curves. — Include a statement as to the completeness with which the 

 depth curves could be drawn, bearing in mind that it is sometimes impracticable in the 

 interests of safety to run sounding lines sufficiently close to shore in rocky areas to permit 

 delineation of all the inshore curves. 



D. Junctions.- — Include a statement as to the adequacy of the junctions (see 

 9342c). Important discrepancies that cannot be reconciled should be commented on, 

 including probable causes. 



E. Comparison unth prior surveys. — State the results of 9343. Prior surveys may 

 be discussed singly- or by groups depending on their character and, where possible, should 

 be listed in chronological order. 



