Sailing on the Mediterranean, which is very nearly an inland sea and has almost negligible tides, is an entirely different proposition from sailing on the Channel, which acts as a funnel for storms barrelling through from the Atlantic to the North Sea and vice versa. For an extreme example, see the Great Storm of 1987 [0], where winds reached hurricane force.
The Royal Yachting Association (UK governing body for all sailing sports) used to, and for all I know still does, regard the Med as inland waters, at least inasmuch as a dinghy-sailing instructor's certificate gained on the Med would not bear the coastal endorsement it would have had it been gained on the UK coast.
The Royal Yachting Association (UK governing body for all sailing sports) used to, and for all I know still does, regard the Med as inland waters, at least inasmuch as a dinghy-sailing instructor's certificate gained on the Med would not bear the coastal endorsement it would have had it been gained on the UK coast.
[0] https://en.wikipedia.org/wiki/Great_Storm_of_1987