30 NAUTICAL CHART MANUAL 



AERONAUTICAL RADIOBEACONS, RADIO RANGE STATIONS (Fig. 23) (M-Mb,-Mc) 



These facilities usually are shown on small-scale charts only when specifically requested 

 and after approval by the Chief, Nautical Chart Division. Where considered to be of parti- 

 cular value in surface navigation, they have been shown on a few large-scale charts. Surface 

 navigators should use aeronautical radio range stations only as radiobeacons. Bearings of 

 radio range courses are not given because: courses cover a fan-shaped area that increases 

 rapidly in width when going away from the radio station; courses over water cannot be flight- 

 checked, so exact locations cannot be given; coiu-ses may stray with changes in atmospheric 

 conditions; coiu-ses are realigned frequently and seldom can be hand corrected. 



For aeronautical radiobeacons and radio range stations, the standard marine radiobeacon 

 symbol (M-3) a magenta ring of 7.1mm. diameter centered over a black dot of 0.76mm . diameter 

 or over the standard landmark s3mibol, wUl be used, together with the letters AERO R.BN., 

 or AERO R.Rge. and the identifying frequency and signal, thus: AERO R.BN. 302 r.is- , or 



AERO R. Rge. 342 ."£;■ . It is not necessary to add operating minutes because they are all 



continuous. 



The attention of the Aids Section shall be called to any aeronautical radiobeacon added 

 to the charts so that appropriate information can be published in the Notice to Mariners and 

 subsequent issue of N.0.0. PubHcation 117. 



The fact that all aeronautical radiobeacons near the coasts will not be shown does not 

 preclude their use by shipmasters. N.0.0. PubHcation 117 contains a list of most of those beacons 

 which are near the coast, with positions and pertinent data sufficiently accurate for use on 

 small-scale charts. 



When the best available position is of doubtful accuracy, an accurate position should be 

 requested through the Chief, Nautical Chart Division. 



In evaluating graphic positions the following standards are to be foUowed: 



a. Positions originating with C&GS topographic or hydrographic surveys or Obstruction 

 Charts are acceptable for charting at scales equal to or smaller than the soiu-ce. 



b. Positions on modern l:24,000-scale G.S. Quads are acceptable for charting at 1:40,000 

 scale and smaller. 



When an aid has been approved for charting, and an accurate position requested, the aid shall 

 carry the notation PA pending receipt of such position. 



TRIANGULATION STATIONS (D-1) 



Triangulation stations, rather than landmarks, should be shown on the charts when needed 

 to control surveys of the Corps of Engineers or when they may be of value to the U.S. Navy 

 in its operations. Only recoverable stations are charted; they are represented by smaU tri- 

 angular symbols. When determined by the Corps of Engineers, the abbreviation C. of E. is 

 appended. Ttie Corps of Engineers' name of the station is also added. 



