The sea mode has never worked closer than 3.5 or so. You have to shoot from manual (Q) mode at closer range. As far as looking in the direction desired, point the guns towards target, then hit ctrl+q, the yellow target grid will be close to your target (you may need to move the mouse to move the grey grid scale near the yellow grid). Use the a and d keys to move the yellow grid left or right and the w and s keys for further away or closer. Generally, if you put the bottom of the lateral yellow grid lines at the waterline of the CV, you will be very close to the distance away from the CV for range.