I usually set up an approach just like I would for a torpedo run, and use the deck gun from a distance of 1,000 meters. Then I set the "range" on the left hand vertical indicator to it's minimum level of 500m. I find this gives me consistent hits right at the waterline.
Couple of points -
First, you'll know you hit the waterline correctly when you see the plume of water AND you see the flash of the explosion. Explosion but no plume of water and you're too high, nothing but water (no explosion) and you're too low. Hitting anywhere else with GWX is a waste of shells.
Secondly, watch the barrel of the gun. It will "settle" and hold it's position momentarily at an even level with the horizontal indicator (I usually use the first level of magnification). In any kind of sea the barrel will be bouncing up and down - time your shot so you fire only when the barrel is even with that horizontal indicator. I used to fire any time the shell was ready and cursed Bernard for sending shells way over the top of the ship I was aiming at - but it's just the motion of the barrel from the sea.
Lastly, as mentioned earlier, keep hitting multiple spots.
I use the flak guns against trawlers. But I'll use the deck gun against the largest targets at night if the sea is calm enough to man it. Which is rare, or at least it feels that way - I'm always in a storm.
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