2. PLANS AND PREPARATIONS 



33 



should be forwarded to the Washington Of- 

 fice at once. All dangers to navigation dis- 

 covered shall be reported to the Commander 

 of the Coast Guard District by dispatch and 

 to the Coast and Geodetic Survey District 

 office. A copy of the message shall be for- 

 warded to the Washington Office with a 

 tracing of the boat sheet or chart showing 

 the exact location of the danger. 



2-37 Chart inspection reports. — In addi- 

 tion to the detailed comparison of surveys 

 with published charts of the project area, 

 each field party while en route to and from 

 the project area should obtain data for revi- 

 sion of charts as time and circumstances 

 permit. The fact that time does not permit 

 the reviser to locate new features should not 

 deter him from furnishing information about 

 changes. New landmarks, waterfront con- 

 struction, and other shoreline changes can 

 frequently be applied to the chart by pho- 

 togrammetric methods. Advance information 

 about changes is useful when scheduling 

 aerial photography. 



The data submitted should consist of the 

 following classes of information : 



(a) Landmarks to be added or deleted. 



(b) Waterfront improvements and 

 changes. 



(c) Bridges to be added or deleted. Give 

 horizontal and vertical clearances if known 

 and type of bridge. 



(d) Removal of piling. — In marking 

 wharves for deletion state whether piles have 

 been removed. In the absence of definite in- 

 formation the feature will be retained as 

 ruins. 



(e) Rocks, shoals, and other obstructions. 

 — Include discrepancies between charts and 

 observed conditions, and local information on 

 reported obstructions. Where it is not fea- 

 sible to obtain positions and soundings on 

 such reported dangers, the report should in- 

 clude recommendations for future surveys. 



(f) Aids to navigation. — Positions of 

 floating aids should be verified. Description, 

 numbering, and light characteristics should 

 be checked. 



(g) Channel depths. — Report indications 

 of shoaling in dredged channels. 



(h) Cable areas. — Report new cable areas 

 not shown on the chart. Include overhead 

 cables with clearances. 



Chart inspection notes should be accom- 

 panied by sections of charts showing cor- 

 rections in red ink. The method of submit- 

 ting such data is discussed in detail in The 

 Coast Pilot Manual, Part 6. 



2-38 Inspection of chart agencies. — A 



hydrographic party may be required to in- 

 spect chart agencies during the season. Spe- 

 cial instructions are issued for such inspec- 

 tions. Forms are supplied for reporting the 

 results of the inspection. 



2-39 Landmarks for charts. — A report 

 on landmarks for charts, in duplicate, on 

 Form 567, is required for all hydrographic 

 surveys. The report shall be submitted at 

 the end of the season for the project as a 

 whole and not for each hydrographic or 

 topographic survey. The original copy is 

 filed in the Chart Division as a chart letter. 

 The duplicate copy should be marked "Coast 

 Pilot Branch." Any sketches or chart sec- 

 tions submitted with the report should be 

 cut or folded to letter size. 



Reports on landmarks shall, if possible, 

 be complete in themselves in order that fur- 

 ther reference to triangulation data and 

 topographic surveys may be avoided. The 

 report shall state whether or not an inspec- 

 tion was made to determine the value of 

 the landmarks when viewed from the water 

 area. 



A separate report on Form 567 shall be 

 submitted for charted landmarks which 

 should be deleted, either because they no 

 longer exist or because they have no value 

 as landmarks. 



Instructions for preparing reports on land- 

 marks, and a detailed treatment of standard 

 nomenclature will be found in" Chapter 7, 

 Sections 18 to 22, inclusive. Note that the 

 geographic positions of all fixed aids to navi- 

 gation which were located during the field 

 season must be reported on Form 567. It 

 is important that the names of the aids en- 

 tered on the form be identical with those in 

 the Light Lists. 



