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galeb777
Pulcino
Croatia
22 Posts |
 Posted - 16/08/2012 : 10:30:16
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Yesterday, while flying, I got "BestAlternate: WARNING, NO LANDINGS" message (it happend couple of times during flight), although I always had at least couple of landables (grass outlanding fields) in reach. I managed to reproduce this on PC (in SIM mode try placing glider where it can't reach any airport, but can reach few outlanding fields), here is screenshot:
[URL=http://img339.imageshack.us/i/lk8000babug1.jpg/] [/URL]
It seems as LK sometimes disregards outlanding fields and just searches for airports.
Has anyone alse notice this behaviour? |
Airspeed, altitude, or brains; you always need at least two. |
Edited by - Coolwind on 03/09/2012 14:16:55 |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 17/08/2012 : 00:04:49
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If you have a nearby obstacle (a mountain for example, and you are not over it for at least the safety altitude over terrain you have chosen in config 5) then the choice is not selected.
So far this was the principle cause of the problem.. |
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Alf
Falchetto
Italy
100 Posts |
Posted - 17/08/2012 : 14:31:54
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| I sometimes experience weird behaviours of that function too. Yesterday, with 3.1F, on a Hang Glider (paraglider mode), in a flatland portion of my flight, my Best Alternate was very reachable, and my destination too. When I got closer to the Best Alternate to almost overfly it while cruising towards destination (and no mountains between me and it) I had the "BestAlternate: WARNING, NO LANDINGS" message. Unfortunately I forgot to notice what the Best Alternate arrival altitude box was indicating at the same time. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 17/08/2012 : 15:34:12
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Did you set a safety altitude, and you were beyond that?
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Alf
Falchetto
Italy
100 Posts |
Posted - 17/08/2012 : 22:56:53
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| No, that should not be the problem. I was above my 300 m Safety Altitude. Anyway, I just found out that I had selected that outlanding as my Alternate 1. I didn't notice what was the automatically chosen Best Alternate a minute before, but maybe that the moment I saw "BestAlternate: WARNING, NO LANDINGS", LK was not considering that outlanding nor my destination (bot reachable above safety altitude) as choices for Best Alternate. I don't think the manual says that, but probably this is the way it works, right? It ignores Destination and Alternate 1 and 2 while looking for Best Alternate. So in that case I simply had flown out of range of another previously valid Best Alternate. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 17/08/2012 : 23:37:50
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nono, that is not correct. Did you start LK before flight, or were you using the PNA since time ago, never resetting it? I am trying to guess, suspecting a malfunction in the list of available options.
In any case we have no enough information to replicate it. Can you see if by selecting that position with the simulator you still get no landings? |
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Alf
Falchetto
Italy
100 Posts |
Posted - 18/08/2012 : 13:00:05
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| The PDA (Mitac Mio P350) had been switched off the day before, and had been started again before the flight. I tried to use the PC simulator placing the aircraft in about the same place. Then I replayed the igc file using the Logger Replay function. In both trials I never saw the message appearing. These trials have only been useful to determine that the chosen Best Alternate was the same one that I had selected as Alternate 1. |
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galeb777
Pulcino
Croatia
22 Posts |
Posted - 19/08/2012 : 09:35:06
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quote:
Originally posted by Coolwind
If you have a nearby obstacle (a mountain for example, and you are not over it for at least the safety altitude over terrain you have chosen in config 5) then the choice is not selected.
So far this was the principle cause of the problem..
This was not the case - I had clear reach to few outlanding fields.
I always start LK before each flight, and exit it normaly after landing.
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Airspeed, altitude, or brains; you always need at least two. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 19/08/2012 : 10:27:28
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| You have the recorded flight, IGC log, right? Please use it to reproduce the error. Once we reproduce a problem, we can fix it. If we cannot reproduce it, it is quite hard to fix it, and I dont even start looking.. |
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galeb777
Pulcino
Croatia
22 Posts |
Posted - 20/08/2012 : 12:33:44
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quote:
Originally posted by Coolwind
You have the recorded flight, IGC log, right? Please use it to reproduce the error. Once we reproduce a problem, we can fix it. If we cannot reproduce it, it is quite hard to fix it, and I dont even start looking..
I replayed igc file on PC in SIM mode, but there was no BestAlternate messages whatsoever. Is this normal in replay mode? Something must work differently when flying for real, because I get BestAlternate messages frequently (when new BestAlternate is selected, and sometimes WARNING, NO LANDINGS).
I will do my best to replicate this, but as now I just wanted to warn people to pay attention to this while flying.
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Airspeed, altitude, or brains; you always need at least two. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 20/08/2012 : 13:22:52
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| I am afraid you are right, best alt warni9ng in sim mode are disabled.. I will enable them back now. |
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galeb777
Pulcino
Croatia
22 Posts |
Posted - 27/08/2012 : 12:16:07
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I replayed igc file on 3.1G version, and I do get BestAlternate WARNING (with outlanding fields clearly in reach), but it seems that this warning happens rather randomly.
One time at flight time 01:01, other time at 01:03, then on another replay all is ok until replay gets to 01:07, or 01:08. I really can't figure this out, but I can confirm that it happens as you can see on the screenshots below (replay of my flight on 3.1G).
[URL=http://img193.imageshack.us/i/lk8000bawbug3.jpg/] [/URL]
[URL=http://img37.imageshack.us/i/lk8000bawbug2.jpg/] [/URL]
[URL=http://img217.imageshack.us/i/lk8000bawbug1.jpg/] [/URL]
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Airspeed, altitude, or brains; you always need at least two. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 27/08/2012 : 13:56:10
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Ok good that you could replicate it. Next step: please zip the entire folder, as it is (no need of Logger data) and upload it somewhere so I can download it, send me the link by mail. Then I can run LK just like you did on your PC, with no possible mistakes, and once replicated the error I can fix it, if it is a bug.
I see you are in the mountains, so I guess it is the safety parameters applying for bestalternate, requiring you to be well over any obstacle, but we shall see in details once I have the zip. |
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galeb777
Pulcino
Croatia
22 Posts |
Posted - 28/08/2012 : 17:30:44
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quote:
Originally posted by Coolwind
Ok good that you could replicate it. Next step: please zip the entire folder, as it is (no need of Logger data) and upload it somewhere so I can download it, send me the link by mail. Then I can run LK just like you did on your PC, with no possible mistakes, and once replicated the error I can fix it, if it is a bug.
I see you are in the mountains, so I guess it is the safety parameters applying for bestalternate, requiring you to be well over any obstacle, but we shall see in details once I have the zip.
Done.
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Airspeed, altitude, or brains; you always need at least two. |
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Coolwind
Moderator
Italy
7511 Posts |
Posted - 29/08/2012 : 15:01:32
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sorry I cannot replicate it, I need a precise position to set the glider on, I cannot spend hours to search for the message.
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galeb777
Pulcino
Croatia
22 Posts |
Posted - 31/08/2012 : 11:50:44
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quote:
Originally posted by Coolwind
sorry I cannot replicate it, I need a precise position to set the glider on, I cannot spend hours to search for the message.
In replay mode fast forward flight (you have igc file in _Logger dir: 2012-08-15-XCS-VIA-01.IGC ) to about 01:00 and then set replay speed to 1x. In next 1-8 minutes it should happen.
I don't know exact position of glider because as I said earlier it happens rather randomly - at different times in flight replay (but somewhere between 01:01-01:08 flight time) |
Airspeed, altitude, or brains; you always need at least two. |
Edited by - galeb777 on 31/08/2012 11:53:25 |
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Topic |
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BestAlternate: WARNING, NO LANDINGS (FIXED)