"Resume own navigation"

JD,I know I have raised an issue that will cause you some stress in implementing, however as you say the Oceanic routes need it, as does most of Australia (although this will be short lived due to ADS-B above FL 290). For pilots with FMC capable aircraft position reporting should not be an issue as the PROGRESS page has the last position time and the estimate for the next and next plus one.Whether or not you actually 'control' using time and or distance standards is an open question. Although if in a non radar environment the TCAS picked up an aircraft at the same level and direction less than 10 minutes (70 miles) (over land)it would not be very real. The ATC couldn't really give traffic as he couldn't 'see' the aircraft.Keep going, it's a good product, I only intend to be constructive.Neil B