Gentleman,How can one tell if you are crossing or about to cross an ATC boundry if ServInfo is not being used. I see some areas request you contact them 10 min PRIOR to entering their boundry.THanks

Are you talking about in the states?Because here, usually a controller will contact you via text asking you to contact him on his freq. Never heard of a requirement of contacting 10 min prior.If the controller DOES contact you, it it will say something like:"Please contact me on xxx.xxx"xxx.xxx being the controllers frequency.Hope that helps! :)