NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: learning sight reduction
From: Lu Abel
Date: 2006 May 4, 10:44 -0500
Carl Herzog wrote:
> .. I convert back and forth between second and tenths of a minute in my head.
As one who grew up in the age of slide rules rather than calculators, I
have found at least one use for an old 6" plastic slide rule.
One thing I find more than a bit annoying about US charts is that while
all coastal and larger-area charts have edge-scales for lat and long in
degrees and minutes, many harbor charts use degrees, minutes, and
seconds. Since my GPS wants data entered in a consistent format (which
I have set to degrees and minutes), when I encounter such a harbor
chart, I have to convert seconds to decimal fractions of a minute.
Out from my nav table comes this old slide rule! Put the "1" over the
"6" (preferably on the A/B scales rather than the C/D scales) and I've
got a very effective seconds to fractional minutes converter!
Lu Abel
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From: Lu Abel
Date: 2006 May 4, 10:44 -0500
Carl Herzog wrote:
> .. I convert back and forth between second and tenths of a minute in my head.
As one who grew up in the age of slide rules rather than calculators, I
have found at least one use for an old 6" plastic slide rule.
One thing I find more than a bit annoying about US charts is that while
all coastal and larger-area charts have edge-scales for lat and long in
degrees and minutes, many harbor charts use degrees, minutes, and
seconds. Since my GPS wants data entered in a consistent format (which
I have set to degrees and minutes), when I encounter such a harbor
chart, I have to convert seconds to decimal fractions of a minute.
Out from my nav table comes this old slide rule! Put the "1" over the
"6" (preferably on the A/B scales rather than the C/D scales) and I've
got a very effective seconds to fractional minutes converter!
Lu Abel
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To unsubscribe from this group, send email to NavList-unsubscribe@fer3.com
-~----------~----~----~----~------~----~------~--~---
