I have tried it with the UFO at high speed and altitude, which is not good enough, so this not to be used for space rendez-vous. :( The tip in this case is for the chasing space vehicle to tune the offset to avoid prediction, for example have an ISS lag in the 150 ms range (positive value). The flight is now very smooth for the speed and altitudes used by the planes. Video of a multiplayer session where the tanker move the drogue to the refueling probe of the plane:
Flightgear manual install#
The other solution is to use NTP, which should do the job permanently, install NTP on Linux, similar on Mac? And there is a NTP program from Meinberg for windows users (need confirmation on this). If a player using NTP have 15260 ms lag in pilot list, using 15.320 s in the offset should give -60 ms lag and if the value is in the same range on his side you should be good. Beware, this value is in seconds, and the lag in milliseconds! You can add an offset to the multiplayer clock (the clock offset in the lag menu). Or it can be simply a clock not synchronized over internet.
For high lag values, it can be a very bad internet connection (for example between Australia and Europe), specially if both sides see something in the same range (and with the same "-" sign :) ). Different fps lead to a bit better or worse lag displayed so 10 ms or so difference is not a big deal. If the values are nearly the same from each side, our clocks are synchronized, and all left is to fly. This is basically the travel time from the computer of the multiplayer pilot to our FlightGear, a bit pessimistic because of delay waiting to be processed at the next iteration.įrom recent multiplayer session, I get in the -50 ms to -70 ms range for lag of multiplayer pilots who have a clock synchronized to the Internet time servers (probably European pilots like me). Lag-ms Is the time in milliseconds between our FlightGear clock and the time present in the packet received from the multiplayer pilots. Something equal or inferior to 1 pps usually show that a different mpserver used, that do not properly relay the traffic, letting only the "lazy rely" at 1 pps work.Ĭhange the mpserver you are on to have a solid 10, if that still do not work, there are sometimes pilots with bad Internet connection dropping too much multiplayer traffic. If all pilots are sending at 10 (which work quite well for the public mpservers) they should have 10 or quite close for this value. Lag-pps Is the number of packets received per second. Next, open the Pilot List ( Main Menu → Multiplayer → Pilot List) and display the Lag page (by clicking on the unit ( IM → Lag → SI). 
The Lag Correction Settings and Pilot List dialogsįirst, open the Lag Correction Setting dialog ( Main Menu → Multiplayer → Lag Settings), enable the Master switch and Apply to close mp.
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