NavList:

Yes, David

We can at times obtain SUPERB mathematically computed observed positions (with correlation coefficients very close to 1.000 .... ) which can send us directly aground onto the reefs !

This is why I have learnt to become extremely (overly ?) cautious about some parts of the Mathematics when used for Navigation, namely Statistics, because they can readily fire back at you if you do not first fully read the (all too often overlooked, if not even lost) Directions for Use Manual and then correctly understand every part of it.

Statistics can NEVER be an excuse for not exercising proper and good sense judgement.

To make things short, stay very careful of Statistical results when all sights only point towards almost one same direction (+/- 180°), except of course, if and when you are familiar with the informations given by the associated error ellipses (see Andrés' results) ... and even, from past near miss experience, I will no longer now take any automated error ellipse at face value every single time.

Magic (software) has its limits anywhere, whether airborne or seaborne. It bears the very same name in either case, just these two simple words :

"HARD GROUND"

Best Regards to all of you

Antoine M. "Kermit" Couëtte
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