I have no idea what your map is supposed to show. Yes, Egypt has one land border with Gaza, and is often closing it, helping to maintain the blockade. But on all other routes - sea, air and other land borders, it is Israel that maintains the blockade. Egypt is not stopping any sea vessels from reaching Gaza - it is the Israeli navy that is doing so, since it controls the entire coast of Gaza. Even if a ship were to move through Egyptian waters into the Gaza coast, it would be intercepted by Israeli ships patrolling the coast.