NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Constructing the next square up on a Mercator chart.
From: Stan K
Date: 2016 Dec 23, 13:21 -0500
From: Stan K
Date: 2016 Dec 23, 13:21 -0500
David,
Attached are the instructions for creating a constant-latitude-scale small-area plotting sheet, taken from a very old Power Squadrons Junior Navigation student manual. They haven't taught this material in years, so I have no problem passing it on.
Stan
-----Original Message-----
From: David Pike <NoReply_DavidPike@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Dec 23, 2016 10:55 am
Subject: [NavList] Constructing the next square up on a Mercator chart.
From: David Pike <NoReply_DavidPike@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Dec 23, 2016 10:55 am
Subject: [NavList] Constructing the next square up on a Mercator chart.
By way of a festive activity, I seem to remember that in the 1960s to progress from basic to advanced training a student RAF Navigator had to be able to cope with being diverted off the edge of his Mercator plotting chart by constructing the next squares up or down using only his pencil, dividers, and Douglas protractor. It involved drawing a line at an angle equal to the latitude and scribing an arc to somewhere, but I can’t remember how to do it any more, and the www isn’t much help. Can anyone remind me of the construction? DaveP
File: 137508.clssaps.pdf
