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Message: <blockquote data-quote="spacedish" data-source="post: 980044" data-attributes="member: 402794">Hi AllSorry I havn't been around for a couple of weeks, after the dodgy ticker do I then got hit by a flu like virus which is only just clearing....still hav,n't had chance to do any work outside :O(I posted the image below to the PP group yesterday which might help explain some of the routes used.You can see the great circle tracks emerge almost like satellite orbits , plus tracks heading North/South which are the polar tracks.Notice also the distinct cut off points , which are where the satcoms disconnect on establishing contact with ADS-B ground stations.</blockquote>