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    Re: R: Problems with AstronavPC
    From: Federico Rossi
    Date: 2004 Feb 17, 14:15 +0100
    Messaggio
    Dear George,
    thank you very much for writing down the equations about fix error from AstronavcPC.
    I've read your email and it proved useful in clarifyng some aspects of the problem, still one thing is still obscure to me: the formula to calculate the variance S reads:
     
    S = F - DdB - EdL cos B(F)
     
    I guess that D and E are the same that appear in the formulas to calculate lat and long of fix while B(F) is the latitude of fix.
    What about dB and dL? Are they the difference respectively in latitude and longitude between the fix and the initially assumed position? If so, what is F?
    Thanks in advance.
    Federico
     
       
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