So it varies for different needs it seems.
Not all pilots have special instrument rating either.
Or
Training Success Rates : r/ATC
The only two that matter are FAA vs NATS rated, the other two are somewhat unrelated. FAA means you’re qualified to be an ATC, NATS is a rating for very high congestion. It’s not a knowledge test but rather an ability test and whether you can handle the traffic or workload consistently over a long period of time. There should have been two ATCs last night for the amount of traffic but there weren’t. Seems to be a shortage of ATCs. The only logical way to change that is to raise the pay so that more people want to enter the field. Supply and demand determines cost
