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Great Circles


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peter@luthaus.de
p
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Hello,
suggested by Tim I post this request in the forum for discussion. I noted (it was already mentioned in the forum) that SkyDemon uses generally rhumb lines to connect waypoints. I find this unsatisfactory and annoying. Industry standard and the wanted way is great circles. There are many reasons why great circles should be used (compared to none using rhumblines):
1) Great circle is the standard for GPS navigation, so built in certified GPS use it and Skydemon is not consistent with the track actually flown even producing off track warnings.
2) For planning the total distance is not so different for short legs, but the off course deviation can be quite large. E.g planning from EDLW to EPWR the rhumb line goes through EDDP Delta, the great circle passes it completely.
3) Most pilots use Lambert projection charts approximating the earth's convergency for planning. So the straight lines drawn on paper will be close to great circles and it is unexpected that skydemon shows a different route.
4) Radials are great circles
5) Airways are great circles
As I find the rhumb line really a nuisance and also other pilots I know do so I suggest changing to great circles. I hope this could be implemented soon.
Peter


Replies
Tim Dawson
Tim Dawson
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rg, the problem with that is loading a route planned by somebody else which has been specifically planned to be "safe" as a RL or GC when your software is setup with the opposite.

T‌67M‌ that idea is promising but for most cases where the GC differs not very much from the RL you'll get a weird small pink line only just protruding from the main thick line which will look odd. We'll get dozens of phone calls every week asking what on earth it is, if we turned it on by default.
rg
rg
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Fair point. So it’s route level then and leave everything as rl with gc hidden by default
GO

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peter@luthaus.de - 7/27/2016 12:01:14 PM
T67M - 7/27/2016 8:26:22 PM
peter@luthaus.de - 7/27/2016 9:10:18 PM
T67M - 7/27/2016 10:20:08 PM
Lars-Vater - 8/4/2016 1:47:13 PM
Tim Dawson - 8/5/2016 11:34:21 AM
JulianScarfe - 8/8/2016 8:19:06 AM
Tim Dawson - 8/8/2016 11:45:11 AM
Tim Dawson - 8/11/2016 10:10:02 AM
T67M - 8/11/2016 11:20:51 AM
Tim Dawson - 8/11/2016 1:30:45 PM
Tim Dawson - 8/15/2016 2:10:24 PM
T67M - 8/15/2016 7:07:20 PM
Stratajet - 1/18/2017 4:53:03 PM
ckurz7000 - 1/24/2017 1:34:43 PM
greg - 1/24/2017 9:39:23 PM
ckurz7000 - 1/29/2017 8:21:40 PM
Stratajet - 1/8/2018 2:49:50 PM
rg - 1/10/2018 11:26:33 AM
peter@luthaus.de - 1/18/2018 10:02:41 AM
Tim Dawson - 1/10/2018 4:57:59 PM
rg - 1/10/2018 5:11:31 PM
T67M - 1/10/2018 11:03:04 PM
Tim Dawson - 1/11/2018 12:19:46 PM
rg - 1/11/2018 12:25:44 PM
T67M - 1/11/2018 1:18:06 PM
ckurz7000 - 1/11/2018 2:05:23 PM
Sky Painter - 1/11/2018 3:29:13 PM
T67M - 1/11/2018 4:12:31 PM
             You make a good and valid point.
Sky Painter - 1/12/2018 3:56:56 PM
Tim Dawson - 1/15/2018 11:16:00 AM
Tim Dawson - 1/18/2018 10:35:44 AM
ckurz7000 - 1/18/2018 12:00:02 PM
peter@luthaus.de - 1/18/2018 1:30:10 PM
ckurz7000 - 1/23/2018 9:14:47 AM
Tim Dawson - 1/18/2018 12:45:42 PM
peter@luthaus.de - 1/18/2018 1:21:09 PM
T67M - 1/18/2018 1:18:10 PM
Tim Dawson - 1/19/2018 11:29:05 AM
Tim Dawson - 1/19/2018 11:30:43 AM
ckurz7000 - 1/23/2018 9:09:32 AM
Tim Dawson - 1/24/2018 3:03:45 PM
ckurz7000 - 1/25/2018 7:57:24 AM
jfw - 1/24/2018 3:51:34 PM
efrenken - 2/6/2018 4:01:02 AM
Cat - 3/22/2018 5:17:33 PM
Stratajet - 5/16/2019 7:44:33 AM
rg - 5/16/2019 8:05:11 AM
Tim Dawson - 5/16/2019 9:56:15 AM
rg - 5/16/2019 10:04:10 AM
T67M - 5/16/2019 10:54:45 AM
Cat - 5/16/2019 10:30:24 AM
Tim Dawson - 5/17/2019 1:59:11 PM
Cat - 5/29/2019 10:31:22 AM
rg - 1/24/2020 7:00:56 AM
T67M - 5/17/2019 3:06:58 PM
ArnaudC - 5/29/2019 10:08:35 AM
Tim Dawson - 1/24/2020 12:18:47 PM
rg - 1/26/2020 5:44:47 PM
hairy_kiwi - 5/19/2020 3:25:33 PM
Tim Dawson - 5/20/2020 9:42:44 AM
checklist - 7/19/2020 1:25:29 PM

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