> So there could be any number from zero up, of international waters waypoints between them? For me, it read like "there was no route between Aa and Ab because

> So there could be any number from zero up, of international waters waypoints between them? For me, it read like "there was no route between Aa and Ab because there were no waypoints available between them". But yeah, without a more detailed breakdown, information, and/or a better understanding of the precise format of the files and procedures, it is going to be a bit of assumption and guesswork.