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Re: Another rhumb line puzzle
From: Gary LaPook
Date: 2011 Jun 5, 12:31 -0700

Using my Casio PB-1000 with the program I wrote for it 25 years ago

I got GC 49.6° T, 3678.4 NM.

RL 83.3° T 3898.9 NM

Using the H.O. 218 tables I get GC course 84° T and 3896 NM.

I get a variation of 13.2 west making the magnetic courses 62.8° and 96.5° respectively.

Obviously, you must keep changing your course when following the GC. For the RL. the true course will stay constant but the magnetic course will be changing since you will be crossing areas with different variations so you can't follow the RL with one set magnetic course at the beginning. if you try to use an average variation then the track will not follow the RL.

gl

--- On Sun, 6/5/11, Herbert Prinz <666@poorherbert.org> wrote:

From: Herbert Prinz <666@poorherbert.org>
Subject: [NavList] Another rhumb line puzzle
To: NavList@fer3.com
Date: Sunday, June 5, 2011, 12:34 AM

I want to fly from New York, 40°38′23″N 73°46′44″W to Vienna. 48°06’39” N, 16°34’15” E. My autopilot is linked to a magnetic compass. Immediately after takeoff, I want to set the autopilot to the appropriate magnetic course and then not touch it again until I arrive. What is that course? (There be no wind through the entire flight.)

Herbert Prinz

40 38 23N 73 46 44W 48 06 39N 16 34 15E

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