NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Star-sight discrepancy
From: T. Shanklin
Date: 2005 Aug 24, 19:14 -0700
From: T. Shanklin
Date: 2005 Aug 24, 19:14 -0700
I don't think it was due to Index Error or Dip. The I.E. (determined before the sight, but not after) on my sextant was .8' on the arc, so I subtracted that from Hs. My height of eye was 40ft, taken from the outer deck of Bolsa Chica State Beach Lifeguard Headquarters (N33 41 W118 03): 35ft to top of balcony+ 5'10" for my own height= 40ft app.= DIP corrn -6.2' also subtracted from Hs. I've double checked all my calculations and have calculated it using a Javascript program provided on a website (http://www.geocities.com/CapeCanaveral/2265/sight.htm). The only thing left is the horizon. Which definetly wasn't clear. There was a fogbank hanging offshore. The eastern edge would have had to be somewhere between 3 and 26 n.m.s offshore (I could see Oil Island Eva along with cargos lined up offshore outside Long Beach, but strangely only Blackjack peak of Catalina Is: low hanging haze/fog). I'm thinking maybe having the horizon 'cut short' might have caused my error. Plus it was hard to find my stars until it got pretty dark (light pollution). So a darkening, fog obscured horizon shot through a whole horizon mirror (saving for a trad.). Approximately how far away does fog need to be to get an accurate fix? ********************** _________________________________________________________________ FREE pop-up blocking with the new MSN Toolbar � get it now! http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/
