915 HYDROGRAPHIC MANUAL PaGE 824 



The use of the proper amount of detail and the development of the text so as to 

 facilitate as much as possible the use of tlie reports of the Corps of Engineers in bringing 

 the Pilots up to date are the most important considerations in writing the Intracoastal 

 Waterway Pilots. 



915. Supplements 



The purpose of these publications is to bring the Coast Pilots up to date by describ- 

 ing the changes affecting the text that have occurred since the edition was issued, and 

 also to give any additional information that is available and of sufficient importance 

 to warrant publication. 



Supplements are issued whenever sufficient material has accumulated, usually 

 about once a year. Each Supplement supersedes its predecessor and must be complete 

 in itself without reference to preceding Supplements. 



An inspection of any current Supplement will reveal the methods used in preparing 

 them. 



The following general rules must be followed: 



(1) Give the page and line numbers affected. 



(2) Where most of the text of a sentence or paragraph in the Pilot is unchanged, give the correc- 



tion by stating that certain words must be deleted or added. 



(3) Where the majority of the text in the Pilot requires correction, give the correction by stating 



that certain sentences or paragraphs should be deleted and others substituted as given. 



(4) Where new information is furnished, direct that additional sentences or paragraphs, as given, 



be inserted in the proper place. 



(5) The rules for writing a Coast Pilot should be followed in preparing a Supplement. 



[ ' f 916. Coast Pilot Glossary 



In the following glossary, the various subjects to be treated in a Coast Pilot are 

 arranged alphabetically with an explanation of the treatment and method of descrip- 

 tion to be used. All cross-references, unless otherwise indicated, refer to items in this 

 glossary. 



ABBREVIATIONS, SYMBOLS, ETC.— Use the Symbols and Abbreviations chart published 

 by the Bureau (see fig. 189). 



ADVANCE NOTICE. — When a Coast Pilot is to be revised, insert a statement in the Notices 

 to Mariners, requesting interested persons to forward to the Washington Office any available informa- 

 tion affecting the Pilot. 



AERIAL CABLES and TROLLEY WIRES. — Give the minimum vertical clearance at mean 

 high water. In the case of high-tension power lines, allow an appropriate safety factor and add a 

 caution note. 



If advance notice is required to have an overhead obstruction temporarily removed for the 

 passage of a vessel, give the necessary details. 



AIDS TO NAVIGATION. — Location, importance, and permanence are the factors that deter- 

 mine the detail to be given in describing aids. For information as to how to describe different classes 

 of aids, refer to the name of the type of aid in question, such as buoys, lights, and beacons. 



If aids are usually removed from their stations, or if the type of aid is changed, during the winter 

 season, explain, but give only approximate dates, except where the Light List gives definite dates. 



When referring to an aid, use the name given in the Light List (see 7843). 



In many places yacht clubs and local authorities maintain local aids during some season of the 

 year. In such cases give a general statement to that effect, but avoid giving detail for, although 

 such aids may be correctly located at one time, they may be differently placed the next season. Avoid 

 making disparaging remarks. Do not name the local authority or give definite dates. (See also 

 Buoys.) 



