feeder fix time/ required time of arrival (RTA)

[ForkTailedDrKiller]

Depends on what equipment you are on. Dare say they expect the 320/73 guys to be pretty accurate (GPS Clocks).

You don't have to peddle a big shiny jet to have access to atomic clock accuracy!

Too easy - just wind it back (vernier throttle in the Bo, in my case!) until the ETA at the waypoint on the GPS is the same as the ATC required crossing time!

Even I can do it, so it must be real easy.

Dr