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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


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Stratajet
S
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So, it came... and then it went... 

I was delighted at the beginning of the week to read that GC functionality had been added to IoS testflight. With a mission planned for yesterday I decided to test it out.

By the time yesterday came however, it had been removed with a simple note saying "nobody seemed to care". Well, I definitely care!

I am a huge fan of SkyDemon. I love the way I can do flight planning on my PC and then have it on my iPad when I fly. I was chatting to a friend who also flies long distances and uses the leading competitor ipad software. When I asked why he didn't use SkyDemon is simply said "It doesn't do Great Circle". It's a known thing for those of us who fly any large distance.

I also remember flying up in Northern Greenland with SD and going way out of my way by following the track - before I realised I was following a RL.

If the functionality has been written to make it work then please can we turn it back on? Even if it's a hidden option somewhere it would be so helpful. It may make 1% difference to distance but when it's costing me £16 / minute to fly (PA31-350 - if you simply have to burn cash, accept no substitutes) over a year it will pay for many, many beers.



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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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