Chapter 3. Aeronautical Information

Section 1. General

3-1-1. POLICY

All geographic (latitude and longitude) and vertical data submitted or used in airspace matters must be based ­on current North American Datum (NAD) criteria.

3-1-2. RESPONSIBILITY

  1. Aeronautical Information Services (AIS)is responsible for coordination with charting agencies and chart ­producers.
  2. AIS 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 purposes.
  3. Any information pertinent to the development of aeronautical information (for example, validation of ­geographical coordinates, airport geographic positions, true radials, etc.) must be obtained from AIS.

3-1-3. TRUE/MAGNETIC DIRECTIONS

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 COORDINATES

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.

3-1-5. DIRECTIONS

Directions must be described as follows:

338_ True - 022_ True = North

023_ True - 067_ True = Northeast

068_ True - 112_ True = East

113_ True - 157_ True = Southeast

158_ True - 202_ True = South

203_ True - 247_ True = Southwest

248_ True - 292_ True = West

293_ True - 337_ True = Northwest