Re: Compensation?
No it's not, no more than the western half of the Atlantic (Shanwick) is Irish airspace, but if you ignore the internationally agreed control of that airspace and crash your plane into another or fly into a high risk published area and bad things happen to you, you'd better have a good explanation ready :)
https://en.wikipedia.org/wiki/Shanwick_Oceanic_Control
https://en.wikipedia.org/wiki/International_Civil_Aviation_Organization
NAV Canada controls the Eastern half of the Atlantic,
A nice map of the internationally agreed flight information regions.
https://www.reddit.com/r/MapPorn/comments/m3n84s/map_of_the_worlds_flight_information_regions_firs/#lightbox