NavList:

   

Reply

I measured my EBBCO parallax yesterday the easy way by taking a
measuring of an edge at 5m and recording the angle (12' I seem to
remember) and came up with a figure of 74mm which I then used to
measure the distance to an object 30m away (saved the hassle of
measuring out the distance with a 5m tape in the rain!)

With my sextant the parallax at 254m is 1', so if you want an error of
less than 0.1' the horizon must be at least 2.5km away!

Mike

On Nov 20, 11:42 pm, Greg Rudzinski  wrote:
> Question for NAVLIST- Is the sextant parallax baseline measured from
> the center of the scope to the center of the index mirror? How far
> should the visible horizon be when used as a reference for determining
> index error? Bowditch offers no explanation.
>
> Greg Rudzinski
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---

   

Reply