AIDS TO NAVIGATION 85 



AERONAUTICAL LIGHTS (Figs. 1, 24) (K-A) 



As the effective range of aeronautical lights is in most cases greater than that of the hghts 

 established for ship navigation, those listed in the Light List should be shown on the charts. 

 The position is indicated on the chart by a dot with a magenta disc 3 mm. in diameter. The 

 light symbol should be accompanied by its characteristics and the abbreviation" AERO." (See 

 Aeronautical Radiobeacons, Radio Range Stations, pg. 30.) 



All true aeronautical lights are rotating in character and are shown on the charts as "Rot." 

 The color is indicated by the standard abbreviations used for nautical lights. The period, 

 height, visibility and number are not charted. 



Obstruction lights, sometimes referred to as aeronautical hghts, are not to be charted 

 unless specifically requested and approval is obtained from the Branch Chief to chart same. 

 When the structure is shown with the landmark symbol and the obstruction light has been ap- 

 proved for charting, the following symbolization shall be used: O "^'^ Since the landmark 

 symbol is used, the magenta disc is omitted. 



A file with a card for each rotating aeronautical Ught is maintained in the Aids Section. 

 This file gives the location and color of the lights. The Radio Facihty Chart Branch of the 

 Aeronautical Chart Division furnishes all information which it receives that can be used in 

 the correction of the card file. The compiler should consult this file before making any changes 

 to charted aeronautical lights. If changes are made, the card should be corrected accordingly 

 and, if necessary, the change should be pubUshed in the Notice to Mariners. 



PRIVATE AIDS (K-17; L-29, -Lf) 



Only those private aids listed in the C.G. Light List shall be charted. If aids estabhshed 

 and maintained by private interests are charted, they shall be marked, "Priv maintd" (in 

 vertical type if fixed, in itahc type if floating). On small-scale charts, or when space is limited, 

 this information may be omitted if charted on one or more large-scale charts covering the area. 



Any fixed unlighted aid not established or maintained by the Coast Guard, and not hsted 

 in the C.G. Light List, should be charted thus:' O marker when approximate, thus: o Marker 



Lighted aids should be shown with the light symbol, proper characteristics and the ab- 

 breviation "Priv maintd". If the aid is not included in the Light List it should be charted thus : 



o Marker (lighted) whcn approximate, thuS : O MARKER (lighted) 



A private light (charting approved by Branch Chief) on a radio tower, or other struc- 

 ture shown with the landmark symbol, should be charted in a manner similar to the following; 



O" ^^ 



F R Lt 



Since in this case the landmark symbol is used, the magenta disc should be omitted. 

 "F R Lt" is the abbreviation for fixed red hght. 



