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    Re: Fix Maximum Probability Positions
    From: John Karl
    Date: 2013 Mar 25, 18:57 -0700


    As I said it's the best estimate of the the track over ground, which includes all factors that the navigator has available, or cares to use -- course steered, distance logged, currents set & drift, leeway....


    OK, great. Then you've used the EPRF that I've been discussing, middle figure in my post 23074. So then you used that same offset to east to plot the 1100/0900 sun line RFIX. Right?

    If so, then this particular traditional running fix gives good agreement between the estimated-track made-good and the updated LOP. The estimated position running fix (EPRF) would give the same result in this case. (They would also agree when the two LOPs are are right angles.) So I don't get the point. Are you showing how well the EPRF works??

    It's when there's a disagreement that the TRF fails and the EPRF gives superior results. Check the 2nd and 3rd figures in my 23074 post.


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