NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Make a UPS? PLease ignore my prior post.
From: Gary LaPook
Date: 2014 Oct 19, 14:44 -0700
From: Gary LaPook <NoReply_LaPook@fer3.com>
To: garylapook@pacbell.net
Sent: Sunday, October 19, 2014 10:36 PM
Subject: [NavList] Re: Make a UPS?
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: garylapook---.net
Sent: Sunday, October 19, 2014 8:51 PM
Subject: [NavList] Re: Make a UPS?
From: Gary LaPook
Date: 2014 Oct 19, 14:44 -0700
Pleas don't read my prior post, I made a computation error with the Meridional parts, I will correct and repost.
gl
From: Gary LaPook <NoReply_LaPook@fer3.com>
To: garylapook@pacbell.net
Sent: Sunday, October 19, 2014 10:36 PM
Subject: [NavList] Re: Make a UPS?
Or we could use Table 6 of Bowditch which gives the
spacing of meridians and parallels. For 34 degrees on degree of latitude is actually equal to 59.891 NM while a degree of longitude is 49.885 a ratio of 0.833 so if spacing then parallels at exactly 60 NM then the Meridians would be spaced at 49.976 NM, only 1/2% difference than using the simpler cosine of the latitude method.
The easy was to construct the plotting sheet using the cosine method is to draw
parallels equally spaced to represent 60 NM and one horizontal line for the mid-latidude. Then from the intersection of the mid-latitude and the mid-longitude draw a line upward from the mid-latitude line by the number of degrees of mid-latitude. Measure along this angled line by 60 units of latitude (60 NM) and draw in the meridian form this point vertically and this will space the meridian at the cosine of the mid-latitude times 60 NM. This is exactly what Hakel's method shows.
gl
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: garylapook---.net
Sent: Sunday, October 19, 2014 8:51 PM
Subject: [NavList] Re: Make a UPS?
About two years ago NavList member Greg Rudzinski came up with a way to accomplish this task using my T-Plotter, see:
Plotting sheet construction with T-Plotter
Plotting sheet construction with T-Plotter
and links therein.
Peter Hakel
Peter Hakel
