The chronometer really does not work for auto-calculating speed, i've just tried for at least one hour.
And more:
If you want to lock a target with the binoculars there's a message that you cannot man the deck gun because of the rough weather. But you can man it with the button at the bottom of the screen.
I engaged a Japanese Convoy with two destroyers one of which I passed at a range of about 400 meters. It did not took notice of me. So I fired at it with my deck gun. It did nothing and went its way. Absolutely ridiculous!
and, and, and ... what a buggy mess!