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Winds aloft referenced from sea level

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Old 3rd December 2007 | 16:53
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Winds aloft referenced from sea level

Can anybody confirm if the winds aloft are ALWAYS referenced from sea level please.
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Old 3rd December 2007 | 20:30
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Nope, they are referenced to a pressure level.
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Old 3rd December 2007 | 21:52
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Correct me if I'm wrong but winds aloft are always quoted in true, the only winds quoted in magnetic are runway surface winds?

Now this is my point, on a nav leg we fly magnetic and calculate drift from our winds aloft which are in true. Never in my training have I been told to +/- variation on the winds aloft or was I just asleep at that point? Has anyone else noticed this or is it negligible in the UK where variation is 4-6o, where I fly anyway.
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