Carriers move in an exclusion zone with support ships, oilers, air defense ships and submarines. The de Gaulle travelled in a 10km bubble at sea, any approaching vessel was warned off. Breaching the bubble gets a destroyer and aviation assets headed your way.
Surprising to me even inshore a sailboat could get that close as that is a huge security issue.
The Charles de Gaulle was on a training mission, sailing unescorted, with no accompanying vessels.This is exactly what I always thought/have been led to believe. AFAIK the CdG is France's only carrier - so all the more reason for an extremely high degree of protection.
But alas, apparently not so...(when the galley serves escargots they have priority...)