NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Eye problems and IE, IC
From: Bill B
Date: 2006 Jul 18, 18:43 -0500
Red wrote:
> With your averaged error of "Difference |0.36'| " and going by the old adage
> "a mile is a minute" that means your eyeball error will put you off by about
> 1/2
> mile. All things considered, that's a zero error when a sextant position at
> sea
> from a small craft may only be accurate within 2-5 miles in the first place.
>
> Just mark your position with a slightly thicker pencil.<G>
I am doing better than that, even in 6 foot seas. My worst was 7 and 5
miles off in my first on-the water observations in 8 ft chop and up to 28 kt
winds in a Catalina 34 with a cardboard sextant (0 mag tube) and the dunes
behind the horizon (no horizon shades). Past that 1.2 to .3 nm off as of
late with the Astra. But all low excepet for the last batch where I used
natural horizon IE. So it does matter to me. (On Lake Michigan it isn't so
much the wave height that beats you up, it's 4-sec intervals that shake the
pans out of the oven.)
Bill
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From: Bill B
Date: 2006 Jul 18, 18:43 -0500
Red wrote:
> With your averaged error of "Difference |0.36'| " and going by the old adage
> "a mile is a minute" that means your eyeball error will put you off by about
> 1/2
> mile. All things considered, that's a zero error when a sextant position at
> sea
> from a small craft may only be accurate within 2-5 miles in the first place.
>
> Just mark your position with a slightly thicker pencil.<G>
I am doing better than that, even in 6 foot seas. My worst was 7 and 5
miles off in my first on-the water observations in 8 ft chop and up to 28 kt
winds in a Catalina 34 with a cardboard sextant (0 mag tube) and the dunes
behind the horizon (no horizon shades). Past that 1.2 to .3 nm off as of
late with the Astra. But all low excepet for the last batch where I used
natural horizon IE. So it does matter to me. (On Lake Michigan it isn't so
much the wave height that beats you up, it's 4-sec intervals that shake the
pans out of the oven.)
Bill
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
