NavList:

I understand this finally. You do not advance a line of position, rather an area of uncertainty. It does strike me that you are throwing out a lot of the points on the LOP (you call it MPP uncertainty). I don't blame you since they fall out of your initial area of uncertainty, which I assume is some contour of probablility.

It does fix a lot of my long-held distrust of R. Fixes, especially with LOP's with small angular differences.

Now since determining this uncertainty area is how this is done, please show me how you do it, since I have no idea how you calculate the area of uncertainty. I am not asking for a reprint if you've typed it before, just point me in the right direction. If this makes any sense to me, I will try it at sea to see if it works in the real world. Of course being able to make the calculations rapidly is key here.

I would love to see this stuff intigrated into an ECDIS. Basically shoot your first LOP and then the second, and based on inputs from the Gyro, clock, and Log (doppler log would be even better since it gives transverse as well as forward motion); advance your area, and then the computer could calculate and plot the areas of uncertainty and then plot our EPRF.

Jeremy
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