Measuring the one way speed of light.
On one side of the room we have a Wi-Fi transmitter remote control.
On the other side of the room we have two accurate clocks next to each other.
The remote will tell the clocks to start and stop with an elapsed time read out.
We will not move the remote during the experiment.
We now use the remote to start the clocks.
Now we pick up one clock and walk one mile away and set it down at a pre measured location.
From the remote to the clock in the room to the clock 1 mile away is a line in one direction.
We now use the remote to stop the clocks and get the read outs.
The distance between the clocks is 1 mile, with the read outs we can get the speed of the signal.
Moving one clock one mile won't make a rat's ass and will be within our margin of error "close enough for government work".