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    Unknown instrument
    From: Federico Rossi
    Date: 2003 Sep 1, 11:08 +0200
    Hi everybody,
    does anybody know anything about instruments used to actually measure the effective refraction error so to apply a correction to the observed altitude more precise than the standard correction given in the nautical Almanac?
    I've found an item on e-bay (2554104294) which I suspect (from the few information I could obtain from the seller) could be such a device.
    Thanks
    Federico Rossi
       
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