Page 741 the smooth sheet 7844 



List, it shall be shown in accordance with 744. If an arbitrary station name has been 

 used in the hydrography, the Light List name shall then be added in red, upper and 

 lower case, slanting letters, in parentheses, immediately below or adjacent to the 

 station name. 



There are also frequent cases in which the position of a fixed aid has been deter- 

 mined in the past and it is designated in the triangulation records by a name differing 

 from the correct one. In such cases the name, as given in the Light List, shall be shown, 

 immediately followed by the incorrect name and date of location in parentheses. 

 Example: Bay Shaft Light (SAND POINT LIGHTHOUSE, 1887). 



(b) Beacons, where shown by chart symbols, should be identified by their numbers 

 only, thus: No. 31, with the number underlined in blue where located by sextant. 

 Where they are shown by control station sj^mbols, the designation should also indicate 

 the color of the beacon. Example: {B Bn No 31). This should be placed immediately 

 below the station name, and in parentheses. (See fig. 169.) 



(c) Buoys do not ordinarily have station names, but they must be identified by 

 their classification and number placed immediately adjacent to the symbol. Examples: 

 N 12,C5,S3,QiQ. 



(d) Where the position of an abandoned light structure is shown, the name must 

 be followed by the word "unused", in black ink and in parentheses, to show it is not 

 in use as a light. Example: BIRD ISLAND LIGHTHOUSE (unused). 



(e) The size of the lettering to be used for names of aids to navigation should be 

 somewhat smaller than that used for station names (see 744). 



7844. Landmarks 



A special report on recommended landmarks for charts is required on Form 567 

 (see 8534). Each landmark, so reported, that is within the limits of the topographic 

 or hydrographic survey must be plotted on one or the other of such sheets. If a land- 

 mark is located by triangulation, the triangulation station symbol shall be used ; where 

 located by topographic or hydrographic methods, control station symbols should be 

 used if the objects were used as control stations during the hydrographic survey; other- 

 wise, the landmark symbol, a small black ink circle, 2 mm in diameter, should be used. 

 If shown on the topographic sheet, it is not necessary that it also be shown on the hydro- 

 graphic sheet, if it is not otherwise needed thereon. It is probable that most of the land- 

 marks so reported will have been used as signals to control the hydrography, and 

 therefore, will be indicated by station symbols with their corresponding station names. 

 To identify these as recommended landmarks, the landmark name as reported on Form 

 567 shall be shown in black ink and in parentheses after the station name, and the word 

 "landmark" in black ink shall be placed in parentheses below the station name, accom- 

 panied by the elevations (also in black ink) of the landmark above the ground and 

 above mean high water, if these are known. (See fig. 169 and 8534A.) 



The hydrographer frequently determines that certain large buildings and struc- 

 tures, not recommended by the topographer, are suitable for landmarks. If these 

 have not been used as signals they should be plotted on the hydrographic survey, the 

 position of each being indicated by the landmark symbol, accompanied by the land- 

 mark name (also in black ink) as reported on Form 567. The word "landmark" and 

 the elevations should be given as required above. If in a large structure, a definite 

 part such as a spire or cupola, is recommended as a landmark, it is necessary that the 

 smooth sheet show its position relative to the remainder of the building (see fig. 155). 



