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Old 08-08-2011, 05:17   #1
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Orthodromic Distance

Hello,
I have a question : is OpenCpn using by calculating of the distance between two points the orthodromic distance mode? Always if I make a mesurament of the distance between f.e. NY and Porto it looks like to be done by loksodromic distance mode.

Thank you in advance

Jacekpio

Sorry for my english.
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Old 08-08-2011, 06:20   #2
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Re: Orthodromic distance

Greetings and welcome aboard the CF, Jacekpio.
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Old 08-08-2011, 08:11   #3
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Re: Orthodromic Distance

OpenCPN uses a loxodrome, or Rhumbline, to calculate distances. (mercator sailing). Great Circle sailing is (so far) available through a few different scripts/programs.
The gc route below, comes from a script available at opencpn.org.
Click image for larger version

Name:	route_new1.png
Views:	715
Size:	136.0 KB
ID:	30272
great circle distance -> 2883M
Approximation of great-circle by the route -> 2893M
Rhumbline/loxodrome -> 2960M

Thomas
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Old 09-08-2011, 01:48   #4
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Re: Orthodromic Distance

Dear Thomas, thanks for your replay. I have supposed that, but it is much better to know . Than one question more - do You know any scripst/ programs that allow to divide a gc route to loxodromic sections with COG to and from the point?
Thanks in advance
Jacek
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Old 09-08-2011, 02:22   #5
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Re: Orthodromic Distance

Once more : I have found gpx, but no idea how to install it. Could you help me?
Jacek
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Old 09-08-2011, 03:35   #6
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Re: Orthodromic Distance

Quote:
Originally Posted by Jacekpio View Post
Dear Thomas, thanks for your replay. I have supposed that, but it is much better to know . Than one question more - do You know any scripst/ programs that allow to divide a gc route to loxodromic sections with COG to and from the point?
Thanks in advance
Jacek
Jacek
Check this page Planning Data | Official OpenCPN Homepage. There is a link to the scrips at the bottom of the page.
The gc script produces a route (gpx file). Instructions how to import a gpx file is available here The Route Manager and Data Import/Export | Official OpenCPN Homepage
Thomas
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Old 09-08-2011, 04:46   #7
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Re: Orthodromic Distance

THX, I have found it - it is the old good DOS.

Thx
Jacek
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