Would this be classed as a GNE
 

Fairly new to Long Haul.

Prior to EEP one of the ETOPS ERAs (say KEF) became unusable (went out of crosswind limits snowclosed etc).

If no replacement alternate were selected before EEP (and you had not replanned using an alternative ERA) would this be classed as a GNE or is that term strictly limited to distance off track?

Thanks in advance.

Have to be off course for GNE.

As galaxy flyer says.
'A GNE within NAT Airspace is defined as a deviation from cleared track of 10 NM or more (note the change from ≥ 25 NM post implementation of the RLatSM trials)'.
Taken from NAT Doc 007 para 8.1.6.