AIM 4-2-10

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4-2-10. Directions

The three digits of bearing, course, heading, or wind direction should always be magnetic. The word "true" must be added when it applies.

EXAMPLE-
1. (Magnetic course) 005 zero zero five

2. (True course) 050 zero five zero true

3. (Magnetic bearing) 360 three six zero

4. (Magnetic heading) 100 heading one zero zero

5. (Wind direction) 220 wind two two zero

Aeronautical Information Manual (AIM) — Chapter 4 — Air Traffic Control
4-1-1 ARTCCs • 4-1-2 Towers • 4-1-3 FSS's • 4-1-4 Recording • 4-1-5 Release of IFR Aircraft • 4-1-6 Visits to Air Traffic Facilities • 4-1-7 Operation Take-off and Operation Raincheck • 4-1-8 Approach Control Service for VFR Aircraft • 4-1-9 Airports Without Operating Control Towers • 4-1-10. IFR Approaches/Ground Vehicle Ops • 4-1-11 UNICOM/MULTICOM Freqs • 4-1-12 UNICOM for ATC • 4-1-13 ATIS • 4-1-14 AFIS • 4-1-15 RADAR Traffic Service • 4-1-16 Safety Alert • 4-1-17 Radar Assistance to VFR Aircraft • 4-1-18. VFR Terminal Radar Services • 4-1-19 TEC • 4-1-20 Transponders • 4-1-21 Hazardous Area Reporting • 4-1-22 Airport Reservation Ops • 4-1-23 Requests for Waivers • 4-1-24 Weather Processor
4-2-1 General • 4-2-2 Radio Technique • 4-2-3 Contact Procedures • 4-2-4 Call Signs • 4-2-5 Leased Aircraft • 4-2-6. Ground Call Signs • 4-2-7 Phonetic Alphabet • 4-2-8 Figures • 4-2-9 Altitudes • 4-2-10 Directions • 4-2-11 Speeds • 4-2-12 Time • 4-2-13 Radio Inop Comm. • 4-2-14 VFR Comm.
4-3-1 General • 4-3-2 Towered Airports • 4-3-3 Traffic Patterns • 4-3-4 Visual Indicators at Untowered Airports • 4-3-5 Unexpected Maneuvers • 4-3-6. Use of Runways • 4-3-7 LLWS/Microbursts • 4-3-8 Braking Reports • 4-3-9 Runway Friction • 4-3-10 Intersection Takeoffs • 4-3-11 LAHSO • 4-3-12 Low Approach • 4-3-13 Light Signals • 4-3-14 Comms. • 4-3-15 Departure Delays • 4-3-16 VFR Flights • 4-3-17 VFR Helicopter Ops • 4-3-18 Taxiing • 4-3-19 Low Vis. Taxi • 4-3-20 Exiting the Runway • 4-3-21 Practice Approaches • 4-3-22 Option Approach • 4-3-23 Aircraft Lights • 4-3-24 Flight Inspection/`Flight Check' Aircraft in Terminal Areas • 4-3-25 Hand Signals • 4-3-26 Uncontrolled Airports With ASOS/AWOS
4-4-1 Clearance • 4-4-2 Clearance Prefix • 4-4-3 Clearance Items • 4-4-4 Amended Clearances • 4-4-5 CDR • 4-4-6 Special VFR • 4-4-7 Pilot Responsibility • 4-4-8 VFR-on-top • 4-4-9 VFR/IFR • 4-4-10 Adherence to Clearance • 4-4-11 IFR Separation • 4-4-12 Speed Adjustments • 4-4-13 Runway Separation • 4-4-14 Visual Separation • 4-4-15 Visual Clearing Procedures • 4-4-16 TCAS I & II • 4-4-17 TIS
4-5-1 Radar • 4-5-2 ATCRBS • AIM 4-5-34-5-3 Surveillance Radar • 4-5-4 PAR • 4-5-5 ASDE-X • 4-5-6 TIS • 4-5-7 ADS-B • 4-5-8 TIS-B • 4-5-9 FIS-B • 4-5-10 ADS-R
4-6-1 RVSM Mandate • 4-6-2 • Flight Levels • 4-6-3 Operator Approval • 4-6-4 Flight Planning into RVSM • 4-6-5 Pilot RVSM • 4-6-6 MWA • 4-6-7 Wake Turbulence • 4-6-8 Pilot/Controller Phraseology • 4-6-9 Contingency Actions • 4-6-10 Accommodation of Non-RVSM • 4-6-11 Climb/Descent to/from Flight Levels Above RVSM