8534 HYDROGRAPHIC MANUAL PaGE 800 



furnished by the Washington Office on request, as will the difference in meters between 

 the field datum and the chart datum. 



The prepared chart, after the information placed thereon has been carefully veri- 

 fied, shall be forwarded by the Chief of Party du-ectly to the Commander of the Coast 

 Guard District in which the area is located, with a transmitting letter stating its pur- 

 pose. There may be included in this letter any explanatory information needed in 

 interpreting the data contained on the chart, although the data furnished on the 

 chart should be complete, if practicable. 



The following data shall be forwarded to the Washington Office: 



(a) A copy of the transmitting letter. 



(6) A list of the objects, with their latitudes and longitudes, that have been plotted on the chart 

 forwarded to the Coast Guard. The list shall be prepared on Form 567, Landmarks for Charts, and 

 should include only those objects not already charted. To avoid confusion with the regular use of 

 the form, the title should be cut off and a new heading, "Objects for Use of U. S. Coast Guard," 

 written in. The datum used shall be stated. 



(c) A special report of this work. 



The transmittal of these data shall be handled as a separate subject. No other 

 field information or notes shall be attached to the forwarding letter, or included in the 

 envelope. 



8534. Landmarks for Charts 



A report on landmarks for charts, in duplicate, on Form 567, Landmarks for 

 Charts, is required for all hydrographic surveys. This report shall be submitted at the 

 end of the season for the project as a whole and not for each hydrographic or topo- 

 graphic sheet. The original copy of Form 567, together with any accompanying charts 

 or sketches submitted, is numbered and filed as a Chart Letter in the Division of Charts 

 (see 8521). For this reason any sketches submitted shall be of letter size or prepared 

 for folding to that size; likewise, any charts submitted shall be cut into letter-size sec- 

 tions. The duplicate copy should be marked "Coast Pilot Section" and notations 

 made on it as to the relative prominence of each landmark, the directions from which 

 each is visible or obscured, and how the landmarks affect the Coast Pilot. Only one 

 copy need be submitted of any chart-sections or sketches. 



Reports on landmarks shall, if possible, be complete in themselves in order that 

 further reference to triangulation data and topographic sheets may be avoided. The 

 report shall state whether or not an inspection has been made to determine the value 

 of the landmarks when viewed from the water area. 



Landmarks no longer in existence or which should be deleted from the chart for 

 any other reason, shall be reported as follows: 



(a) Where only a few landmarks are to be reported, Form 567 may be used. The geographic 

 positions need be given to the nearest tenth of a minute only. List these on a separate copy of the 

 form and not with new landmarks to be charted. 



(b) Where a number of landmarks are to be reported, chart-sections shall be submitted on which 

 the landmarks to be deleted are indicated (see B(3) below). Form 567 need not be submitted. For- 

 ward these chart-sections by a transmitting letter, a copy of which shall accompany other reports on 

 Form 567 submitted at that time. 



Flagstaffs and flagpoles, because of their temporary nature, should be listed as 

 landmarks only where there are no other suitable objects in the vicinity or if they are 

 of a very permanent nature. 



