Thanks spooky.
I will look for the FAA inspector's handbook. There doesnt seem to be any other guidance for areas outside the North Atlantic, so is it airmanship the requires it? If so what are the arguments for and against?
If I am right the MNPS manual talks of it in terms of preventing errors during input into an FMS. So, with fixed routes that are stored in the NDB why bother?
Are there any areas that might be ETOPS but be still class I (within range of normal nav aids), eg. Australia maybe?
Thanks