NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: The Darn Old Cocked Hat - the sequel 1
From: Tom Sult
Date: 2013 Mar 12, 17:58 -0500
From: Tom Sult
Date: 2013 Mar 12, 17:58 -0500
I am not a math guy. (Only 2 years of calc may years ago). But I wonder if it would be interesting or useful to look at probability of the location of the fix as a function of the size of the DOCH. I think the size is a function of skill, sky and see state. A larger hat (mine have been know to be 200 mile, oops) suggest a problem. If the Hat is large but the s.d. Is not large for each line of position then the tails of the "bells" will have less overlap. If the hat is large and the s.d is also large then the probability map would not change, it would only be bigger... Or so I imagine.
Most of this is only interesting trivia. The best guess is someplace near or in the hat. For ocean nav that is good enough. If you are navigating the windward island (infested with reefs) you best have a watch posted. (And a GPS)
Tom Sult
Tom Sult
Sent from my iPhone
Andres:Of course there are those cases. They are part of the game.What I hoped we could possibliy achieve when I set out withthis model was that we find the - on average - most probable fix.Unless I have more info about a particular fix I think thats all I can do.BTW: Andres, on the first look I cannot see if you agree or disagree with my model.Regards
From: Andrés Ruiz <navigationalalgorithms---com>
To: hannoix---net
Sent: Tuesday, March 12, 2013 12:57 PM
Subject: [NavList] Re: The Darn Old Cocked Hat - the sequel 1
Hello Hanno Ix,first, thanks for your papers.You wote:The CG of a DOCH is a solid approximation to TL.Attached File: 122810.celnav error part2.pdf (no preview available)There are some times that the MPP is out of the COG, depending on the azimuths.see:
