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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
 Posted - 25/07/2017 : 10:03:19
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Recently I had a flight in wave, where the wave was only in certain small areas. The soaring technique was lazy circles(30 secs)drifting downwind until the lift dropped off, then back into wind, and repeat, ad nauseam. The wind was very light.
It was very noticeable that the heading shown on the screen, lagged the actual heading by several seconds, equivalent to 30/40 deg. Obviously with 1 sec logging there is always going to be some delay, but this did seem rather a lot, and if you are using to assist thermal centring, does it mean that the direction to move the circle is a few seconds late? |
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brunotl
Pterodattilo
France
1097 Posts |
Posted - 25/07/2017 : 10:31:39
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| Heading is send by GPS, so that can depends of GPS Chips and filter implemented inside ... |
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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
Posted - 25/07/2017 : 18:16:47
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| This is from gps in Flarm, but how can gps send heading? It can send track, but without a compass, surely can't send heading. |
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brunotl
Pterodattilo
France
1097 Posts |
Posted - 25/07/2017 : 18:50:23
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quote:
Originally posted by davesalmon
This is from gps in Flarm, but how can gps send heading? It can send track, but without a compass, surely can't send heading.
sorry, you right, GPS send Track, but latencies are same for twice... |
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Swap
Pulcino
France
17 Posts |
Posted - 27/07/2017 : 23:40:38
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GPS give the heading by the line between two positions..
So, there is a delay between the moment you see your heading and the real heading you are.
The only solution is to have a higher frequency on transmission..
I use XC Tracer 2 and it gives 5 positions per second. Consider also a GPS not give a precise position in all directions (X,Y,Z) |
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Coolwind
Moderator
Italy
8957 Posts |
Posted - 28/07/2017 : 13:44:15
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| Are those 5 Hz positions interpolated or real ? |
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Sync of heading/track