[Dogfish40]

Anybody got some tips for aproaching the enemy in heavy fog. Here's my problem; First off, I'm not going to cut the fog down because it's pretty realistic, this was a problem that Subs faced and I'm going to keep "volumetric fog" checked.
So... I'm approching an unknown merchant in heavy fog; by the time I can see his masts, the ship is only 7 or 800 yrds off the beam. He may be armed, he may be friendly (some of those Dutch merchants look a bit like the Marus) but I have to know before I send him down. Do I, a) let him pass to get a recognition and then give him a shot up the rear? b) Sink him outright and hope he's the enemy? c) or let him go? This fog isn't even the worst I've found, and the periscope is even worse, to see the ship I need to be on the bridge. If I can see the flags I am close enough to be rammed or shot up. The fog makes getting Torpedo Data extremly hard over 500 yrds. I've sunk two ships now with the deck gun, but until I got the message "enemy ship sunk" I wasn't sure if I was sinking a friendly. (I'm trying not to cheat and take a peek if you know what I mean)
How 'bout some Fog feedback from some of you Skippers out there!
Thanx
D40