Ducimus is right. Besides he learnt these lessons the hard way from SH3 and has appiled it to SH4.
And TM 1.4 is the advanced version of hide and seek.
Along with the other included parts to TM 1.4. It's not just eyecandy you know.
Never ever give your enemy your broadside... meet him headon and as slow as you can, or stopped. And always make sure Silent Running is the norm when meeting up with them. And only use your 'scope when you need to. The enemy wears glasses and can see your 'scope just fine when the bloody thing is sticking out of the water... it's a dam calling card saying "Here I am, come get me !"