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Simple-time tries to ensure that Flightgear multiplayer sessions see a consistent and smoothly-varying view of each other, regardless of frame rates or network delays.

For example in multiplayer refueling, each pilot will see the same relative position of the two aircraft.

Using simple-time

Simple-time is enabled in the "Time Mode" dialogue from menu File/Time Mode, or from the command line with: --prop:bool:/sim/time/simple-time/enabled=true.

There are no configuration settings.

More information

Simple-time works by putting the host system's UTC time in MP packets and recordings, and using extrapolation to position MP aircraft using information that is necessarily always slightly out of date.

For details, see: flightgear/docs-mini/

Also see Real Time manual, which is a more customizable system that addresses some of the same issues.