Appropriate Cammo works - I made a post about the classic "mechanics blues/greys" being pretty much the ultimate 'urban cammo', both because you are something "expected", and the color!

As for "Dazzle Cammo" - It WASN'T to hide the ship at all, in fact it actually made it EASIER to SEE, what it DID was make it harder to see which way it was moving - a term called "angle on the bow" that you may have heard in movies

OK folks - Not one of MY projects, but at a company I worked for we repaired/overhauled OLD style (read Just post WWII) Target Motion simulators

Picture You're in a sub - You've spent a bunch of time figuring that the enemy ship is zig/zaging it's way to you, and is doing say, 10 knots - You raise your scope, and there he his - 10K yards away, he's at a 25 degree angle off your bow (aka slightly to the right), and is GENERALLY coming towards you - the thing is, what YOU don't know is actually what direction he is heading - is he coming straight at you, 10, 20 , 30, 40 degs to either side of that line? You don't KNOW - you have to LOOK at the target, and GUESS. (I'm using subs, but for navel gun fire, it's the same problem) A mistake of 10-15 degs (or MORE) on the "angle on the bow" number is the difference between a hit, and a miss - heck, they only reason it's not worse than that is that subs fired a "spread" of torpedos - 2-3 or more at the target, on slightly different headings, so that if the target changed motion, or you guessed wrong, you MIGHT still hit - remember, WWII torpedos were NOT homing torpedos, they didn't LOOK for the enemy ship, plus, you really needed (and still do) to limite the amount of time your scope was up, so you only have 30 seconds or so to find the enemy ship, get a bearing, a range, and an angle on the bow

BTW, the computers that kept track of this were called TDCs - and like I said, I got to play with them
http://en.wikipedia.org/wiki/Torpedo_Data_Computer

Oh, and it seems that the Germans invented the Homing torpedo in mid wwII

BTW, todays torpedos are amazing devices - they are/can be wire guided by the sub, are amazingly fast (I don't know the offical number, as I didn't have the 'need to know'), have farly amazing build in sonar, and quite a bit of computing power onboard to interpert that sonar data

If you want to know what they are talking about today:

http://en.wikipedia.org/wiki/Mark_48_torpedo