Hi guys, I got slightly bored today, and after a little Google Earth here and a little photoshop there, I put a grid over Surigao Strait to the game's scale (1 sector = 5000 yards).
And if it comes out hard to tell how to classify each sector due to low res or something, here's something to clarify it; blue=sea, pink=island/coast, yellow=island/coast but it should probably be modified/treated as sea for game reasons, red=coastal sector that makes a little strait for "shallow draft" units, unmarked=obviously sea or land, and land can't be accessed by "shallow draft."