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 shall be
based on current North American Datum (NAD)
criteria.
3-1-2. RESPONSIBILITY
a. Aeronautical Information Management (AIM)
is responsible for coordination with charting
agencies and chart producers.
b. AIM shall 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.
c. Any information pertinent to the development
of aeronautical information (e.g., validation of
geographical coordinates, airport geographic
positions, true radials, etc.) shall be obtained from
AIM.
3-1-3. TRUE/MAGNETIC DIRECTIONS
All radials, courses, and bearings specified in an
NPRM shall 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 shall be included in
degrees, minutes, and seconds.
3-1-5. DIRECTIONS
Directions shall be described as follows:
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338° True - 022° True = North
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023° True - 067° True = Northeast
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068° True - 112° True = East
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113° True - 157° True = Southeast
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158° True - 202° True = South
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203° True - 247° True = Southwest
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248° True - 292° True = West
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293° True - 337° True = Northwest
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