fadec degraded - read the definition that Maeroda posted - it clearly says
Offshore operations means operations which routinely have a substantial proportion of the flight conducted over sea areas to or from offshore locations"
what don't you understand by offshore locations? - ie if you land on an island that would be an onshore landing not an offshore one.
I have thousands of overwater hours from SAR but have only landed offshore on a couple of occasions - that does not make me 'offshore qualified' no matter how you try to spin it.