NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Mercator vs. Great Circle Charts
From: Dave Weilacher
Date: 2001 Aug 29, 7:13 AM
From: Dave Weilacher
Date: 2001 Aug 29, 7:13 AM
So here are my answer to the test. Please tell me where I've screwed up. Re: 1. Can true direction be determined in the same manner for all locations on a Re: Mercator chart? How about on a great circle chart? Re: Yes and Yes. (Of course the 1st yes is supposed to be no on the test) Re: 2. How is the compass rose used on each of these charts? Re: Clueless. Re: 3. If I were to draw a straight line between two points (say Tokyo and Cabo Re: San Lucas) on both a Mercator chart and a great circle chart, would either Re: straight line represent a great circle? Re: Yes. Re: 4. Given the straight line drawn between Tokyo and Cabo San Lucas (see Re: above), which chart, the Mercator or the great circle, would give me the Re: shortest route between these two points? Re: Great circle. Re: 5. Would sailing a great circle course always be the best way to travel Re: across the ocean, or would ships have to take into consideration unfavorable Re: winds, currents, or storms that might cause a delay? Re: Not always for resons suggested plus land masses in the way. Maybe even ice. Re: 6. Do most large ships today use computer assistance to help them choose the Re: best course across the ocean? Re: Yes. (In a manner of speaking) --------------------------- Did I pass? -- Dave Weilacher .USCG lic. 889968 .ASA certifed sailing instructor 990800 .AS400 RPG programmer _______________________________________________ Get your free email from http://webmail.earthlink.net