NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Leg 56
From: Millard Kirk
Date: 1999 Jul 17, 7:52 PM
From: Millard Kirk
Date: 1999 Jul 17, 7:52 PM
Nav List.
Dan I have figured where I went astray. I was doing the DR in magnetic.
Working the problem using True Course I get the same answer. Although when
I do DR on an adventure I convert most to magnetic.???? Maybe it is easier
because we steer the boat using a magnetic heading. I seem to want to use
every variable given in a problem such as variation and deviation.
On my recent adventure from Norfolk, VA to Block Island a question arose
on the leg from Cape May to Block Island between me an the captain. Using
two different charts to get the course I got the Lat/Lon for the start of
the leg from one chart and the Lat/Lon for the end of the leg from a second
chart; the captain used a small scale chart to plot the course. I used my
Celesticomp V to compute the course and he drew the course on the chart.
There was a difference to be resolved of about 10 degrees. He could not
figure the difference. He was working with True Course and I had taken the
variation from the charts and converted my course to magnetic. When I
asked him did he consider the variation, he realized we had the same course
only one was true and the other magnetic. We set the auto helm to the
course corresponding to the compass course, and to my amazement Block
Island, RI showed up a day and three quarter later. We never touched the
helm until the entry into the Great Salt Pond at New Harbor, Block Island,
RI.
Still...............
Learning the Hard Way!!
Millard Kirk KB8YQO | mailto:mkirk@marshall.edu
116 Lewis Ave | http://webpages.marshall.edu/~mkirk/
Barboursville, WV | A West Virginia Blue Water Sailor
25504 | Phone: (304) 736-6544
| First United Methodist Church,
Barboursville, WV
| Homepage
http://www.gbgm-umc.org/bfumcwv/
