[QUOTE=WLIU;46818]Well, for the next 5 years not everyone will have mode S and there is some likelihood that the OSH arrival will be filled with non-mode S for some time well beyond 2020.

Mode S transponders provide one of two methods for ADS-B. Mode S transponders are assumed to be the solution for airliner-class aircraft. Universal Access Transceivers (UAT) provide ADS-B service and also provide Flight Information Service Broadcast (FIS-B). They are assumed to be the better solution for GA aircraft. I'm sure the NOTAM is silent on UAT. So strangle your parrot but, unless told otherwise, leave your UAT on.

Al B12