Re: Contest/Game - Identify this picture
The cardinal system is identical in both the IALA A and IALA B buoyage systems.
Found this, so Europe is possible. The Cardinal buoys are treated identically in both systems, unlike 'red/green' either side of the pond. The one in the pic is indeed and East cardinal.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)