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Related to magnetic variation: Magnetic deviation
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References in periodicals archive ?
In 1701 the Paramore surveyed the English Channel on a mission as much concerned with spying out French harbours as with measuring magnetic variations. Interestingly enough, it was impossible to find volunteers to crew the ship, suggesting that the misadventures of the earlier voyages were well known.
If the you see a published transition you think should be legal, or at least marked NoPT because the angle appears to be less than 90 degrees, the reason probably lies in decimals of magnetic variation.
SIDs and STARs use the airport's magnetic variation of record, which is monitored more closely, evidenced by the frequency of runway number updates.
The difference between true and magnetic north is called "magnetic variation." This is also referred to as "magnetic declination."
The application in the device is similar to iFly because the course a pilot sees when navigating between two points will update as the local magnetic variation changes.