Chapter 3. Aeronautical Information
Section 1. General
All geographic (latitude
and longitude) and vertical data submitted or used in airspace matters must be
based on current North American Datum (NAD) criteria.
Information Management (AIM) is responsible for coordination with charting
agencies and chart producers.
b. AIM will
furnish appropriate aeronautical chart cutoff and publication dates. Cutoff
dates are 9 weeks (10 weeks for action involving flight check) in advance of the
publication date to allow sufficient time for charting and chart distribution
c. Any information
pertinent to the development of aeronautical information (e.g., validation of
geographical coordinates, airport geographic positions, true radials, etc.) must
be obtained from AIM.
All radials, courses, and
bearings specified in an NPRM must be stated both as true and magnetic, except
magnetic need not be stated in terminal airspace notices.
3-1-4. NAVIGATIONAL AID
When a navigational aid (NAVAID)
is used as a reference point in a controlled airspace description, its
geographic coordinates must be included in degrees, minutes, and seconds.
Directions must be
described as follows:
338° True - 022° True =
023° True - 067° True =
068° True - 112° True =
113° True - 157° True =
158° True - 202° True =
203° True - 247° True =
248° True - 292° True =
293° True - 337° True =