Questions tagged [magnetic-variation]

Questions about the difference between magnetic north and true north, which various based on geographic location

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34
votes
1answer
2k views

Where do I land if I fly from KLAX with a constant east heading, crossing the US and the Atlantic ocean?

Los Angeles KLAX and Casablanca GMMN (Morocco) are at the same latitude. If the aircraft follows a magnetic 090° heading, the initial true heading will be 102° due to the declination. (source ...
35
votes
4answers
62k views

When are winds given with respect to true vs. magnetic north?

Wind information can be reported by various sources (ATIS, METAR, TAF, spoken on the radio, etc). I was taught that officially some of these sources are relative to magnetic north and others to true ...
25
votes
5answers
104k views

What's the difference between True vs Magnetic headings?

What is the difference between a true and a magnetic heading? Why are/were magnetic headings used in aviation?
26
votes
2answers
10k views

How do airports determine when they should change their runway numbers?

Runway numbers in most of the world are based on the runway's orientation relative to magnetic north. For example a runway with a magnetic heading of 135° to 144° will be numbered ...
13
votes
2answers
19k views

How do I convert true heading to magnetic heading or the other way around?

Is there a method by which the conversions can be achieved on the fly by using a mathematical formulae and not using specific area charts?
4
votes
1answer
605 views

Is my understanding of magnetic variation and declination (for a VOR) correct?

AIXM (the XML-based exchange model for AIP by Eurocontrol and european AIS) defines the following properties for a VOR: codeTypeNorthA code indicating the ...
2
votes
1answer
2k views

Why do METAR's report wind relative to true north rather than magnetic?

Why isn't the wind in a METAR given in magnetic heading, to match the runway numbers? Especially for areas where there is a double-digit magnetic declination. Secondary/optional question: does the ...
1
vote
2answers
423 views

What course should be taken to make estimated calculations?

(skyvector.com) When I want to calculate the leg time from GIJ to CRL going along the airway J554, at say FL190, I know that I have to calculate the ground speed first, but in order to do that, ...