1591 HYDROGRAPHIC MANUAL PaGE 46 



unit and the survey ship, all gathered into one comprehensive report (see 385). 

 The report should be submitted in duplicate, the information to be contained therein 

 and the manner in which it should be furnished being described in 912 and 916. In 

 all cases where the information in the published Coast Pilots is found to be accurate 

 and adequate, a statement to this effect should be included in the report. 



Such data should not be made a part of the Descriptive Report or if they are 

 included therein they should be repeated in the special coast pilot report. 



Important information and especially anything affectmg the safety of navigation 

 should be forwarded to the Washington Office at once and dangers to navigation dis- 

 covered should be reported by radio. 



1591. Photographs 



Photographs of field activities, personnel, and equipment, particularly when they 

 illustrate actual survey operations, are of considerable value. Chiefs of Party are 

 directed to have such photographs taken whenever practicable and forwarded to the 

 Washington Office. Photographs are particularly needed illustrating new equipment, 

 new types of apparatus, and the various kinds of signals and buoys. Photographs are 

 also needed illustrating new techniques of actual field operations. 



Negatives are preferable to prints since they afford better reproduction. Photo- 

 graphs should be comparatively large or be taken with a camera that will permit 

 subsequent enlargement. An effort should be made to obtain sharp distinct outlines 

 and decided contrasts. A photograph of a piece of equipment or other inanimate 

 object should include a person standing nearby or an object of known size to show 

 relative size. 



Photographs intended for illustrations in Coast Pilots should be taken from a 

 position where the view would likely be most useful to the mariner, such as when mak- 

 ing a landfall. In a region where the coast may be closely approached with safety, 

 photographs of distinctive features which can be identified during low visibility are 

 especially useful. In this case they should be taken close to the feature. The title 

 of a photograph intended for a coast pilot illustration must always include a statement 

 of the distance of the feature and the direction toward which the camera was pointed. 



The negatives or duplicate prints of illustrations for a season's or special report 

 should be submitted separately so that the report will not be mutilated by removing 

 the photographs for registration and filmg. 



A photograph is useless unless it is accompanied by certain descriptive and his- 

 torical data. Each photograph or negative should be accompanied by Form 623A, 

 Photographic History, on which information should be furnished for items 3 to 8, 

 inclusive, and item 13. The descriptive title should be sufficiently comprehensive to 

 leave no doubt regarding any feature of the photograph. After a negative has been 

 registered, prmts may be ordered by reference to the registry number. 



16. GEOGRAPHIC NAMES 



Correct geographic names are essential on every nautical chart. In well-populated 

 areas many geographic names are soon well established in local usage because of the 

 need people have for referring to the features in their vicinity. But even in un- 

 populated regions distinctive names for the more important geographic features are 

 necessary for the intelligent use of charts and Coast Pilots. It is distinctly annoying 

 and conducive to error to have to use latitudes and longitudes or long descriptive 

 phrases to refer to geographic features. 



