ADS vs. ETP Lat/Long
I'm trying to locate a point of reference for this subject. I'm constantly seeing oceanic flight plans with the ETP coordinates embedded within the flight plan legs data. Other than common sense I cannot find anything that prohibits this practice and it would seem obvious that any other flight plan routing than the exact ICAO waypoints would be out of bounds for any type of CPDLC/ADS flight following.
If any of you have a source that you can point to, I would appreciate it if you can pass it along.