"Sector Radar ("bar dar"): RAF only, altitude 200 feet and up, 4 minute update"
I had the same question during the planning of Frame 1. I never really got a definitive answer but my interpretation was it would be just like in the MAs EXCEPT there is a four minute delay on the reporting of the blip. Therefore, the blip could be off a full sector by the time it appears as we've seen in other scenarios.
Now the real question I had but could never really get an answer on... how long is that low-level attack bar on the map?
A) Four minutes until the next radar cycle
B) Just the 1.5 seconds the pilot is above 200' with a four minute delay
C) Some other combination