Bjammin said:Never been questioned and have fly 250kts all the time, dosen't mean I'm right, just think maybe some controllers care and others don't. So back to the original question I guess, if you don't have a sectional, how would you know you are under Class B?
You may not have been questioned but I have. You need to be at 200kts below class B. Don't forget this also comes into effect when you are departing from an airport that is under a class B. I have to sometimes remind myself not to speed up to 250 until I am either outside the class b or in it.
It doesnt matter if you are IFR or VFR. Speed is speed.