RULES AND PRACTICES 19 



COAST PILOT 



The Coast Pilots of the Coast and Geodetic Survey are a series of nautical books that 

 cover a wide variety of information important to navigators of United States coastal waters 

 and Lntracoastal waters. Most of this book information cannot be shown graphically on the 

 standard nautical charts and is not readily available elsewhere. Coast PUot subjects include 

 navigation regulations, outstanding landmarks, channel and anchorage peculiarities, dangers, 

 weather, routes, pilotage, and port facilities. Coast Pilots are prepared from field inspection 

 notes by special Coast Pilot ship or shore parties. The principal purpose of an inspection is 

 to verify and revise statements in the Pilot and charted details. Cumulative Supplements, 

 containing changes reported since dates of editions are published each year. 



In addition to serving the navigator. Coast Pilots can be used to an advantage by the 

 nautical chart cartographer. Cartographers should not overlook the abundance of information 

 contained therein that can assist in evaluating the importance of individual features that can 

 be shown on nautical charts. An examination of the Coast PUot together with the Light 

 List will aid considerably in selecting names and other features of importance to the navigator. 



AEKIAL PHOTOGRAPHS 



The Photogrammetry Division shall make topographic corrections from aerial photo- 

 graphs on Drawings in accordance with the priorities estabUshed by the Exhaustion Report. 

 The Chief of the Conventional Chart Branch, Nautical Chart Division, shall be responsible for 

 the assignment of such charts. 



COMPILATION REVIEW 



Every chart must be thoroughly reviewed. Review must include every sounding, ele- 

 vation, name, and hydrographic and topographic feature. Special care must be taken to see 

 that every danger, danger curve, and channel is distinctly and correctly represented. 



SHght and unimportant inaccuracies ordinarily need not be changed. For instance, sound- 

 ings, the locations of which are in error by less than half the width of figures, need not be 

 moved. No two cartographers will make the same selection of soundings in an area; therefore 

 the selection of soundings should not be changed unless there is an opportunity for a distinct 

 improvement. 



The review of new or reconstructed charts shall be made on cellulose acetate overlays. If 

 changes are necessary, the compilation must be returned to the original compiler for correction ; 

 otherwise, the same type of mistake might be repeated. 



