9133 HYDROGRAPHIC MANUAL PaGE 814 



When the information in the report is not checked by actual inspection, the source 

 should be given, so that its value may be weighed against possible conflicting informa- 

 tion that may be received at the Office. 



District Headquarters. United States Local Inspectors. 



Chart agencies. Yacht clubs. 



United States Corps of Engineers (District and local). Operators of repair yards and marine railways. 



Branch Hydrographic Offices. County and municipal engineers. 



Maritime associations. Towboat captains. 



Pilot associations. Captains of coastwise vessels operating in the area. 



Fishermen associations. Individuals very familiar with the area, such as fishermen, 

 State organizations for port and waterway improvement. old residents, and town officials. 



Port managers. Engineers or officials in charge of water terminals (such as 

 Harbor masters, Harbor police. railroad wharves), or sewage disposal. 



United States Coast Guard headquarters and all stations, 

 including masters of lightships and tenders. 



9133. Chart Inspection in the Field 



a. Charting data. — While inspecting a region for coast pilot revision, an excellent 

 opportunity is afforded the reviser to note changes necessary on the charts and to obtain 

 data for their revision. 



Wliile a reviser is not expected to have time to locate accurately all features 

 necessary for chart correction, or to undertake actual surveys, much useful information 

 can be submitted and frequently locations adequate for charting may be obtained with- 

 out appreciable loss of time. But the fact that time does not permit the reviser to 

 locate features should not deter him from furnishing information about changes. The 

 information is useful as history and directs attention to the necessity for revision 

 surveys. 



The data submitted should consist of the following classes of information: 



Landmarks. — To be added or deleted. Definite statements regarding deletion of landmarks 

 should be made. A statement that a landmark is no longer prominent is not sufficient. (See 155 

 and 8534.) 



Waterfront improvements and changes. — Include condition, additions, and deletions of wharves. 



Bridges. — To be added or deleted, including information regarding horizontal and vertical 

 clearances of fixed bridges and drawbridges. Where new bridges are indicated on chart-sections, 

 information regarding the roads leading to them should be furnished, if possible. (See 916, Blueprints 

 or maps obtained locally.) 



Removal of old piling. — In marking wharves and bridges for deletion, information regarding the 

 removal or existence of old piling should also be obtained and furnished to the Office. This is im- 

 portant, and the reviser should state definitely whether the information is sufficiently reliable to war- 

 rant deleting the feature or whether it should be retained as ruins. 



Rocks, shoals, and other obstructions. — Include discrepancies between charted condition and 

 actual condition which may be observed or reported. Local authorities should be consulted regarding 

 the existence of uncharted rocks, shoals, or other obstructions of importance to navigation. Where 

 it is not feasible to obtain the positions of such reported dangers, a report should be made to the Office, 

 with recommendations for future surveys. 



Fixed aids to navigation. — Include structures carrying airway obstruction lights, as well as other 

 lights, such as isolated neon signs, which might be useful to the mariner. 



Geographic names. — Include changes, additions, and deletions, giving authority. Use check- 

 mark on chart-sections, if charted name is correct. 



The coast pilot reviser has an excellent opportunity to verify charted names and to obtain new 

 ones. Submission of such data should follow generally the instructions given in section 16. 



Dangers charted. — Include those charted as "Reported", "E D", and "P D". 



Channel depths. — Include conditions of shoaling. Charted channel depths should also be checked 

 with local information and, if possible, blueprints of the latest surveys should be obtained. If no 

 recent survey exists, a statement of the present reported depth should be made, giving the authority. 

 (See 916, Channels.) 



