Indispensable!!!!
Type XIV "MILK COW"
And associated missions for them.
Also a AI coordination for wolfpacks in single player and campaign.
The Luftwaffe must explore the ocean too.
Fluid communication by radio (with ability by the AI to answer something intelligent, not non sense phrases like now), the morse code
BACK!!!
A acurate map with the current deep.
Get lost in the ocean because my navigator can not see the sun and the stars when it is stormy.
A device to transmit light signals.
A pistol to fire flares.
SNOW and ice in winter!!!
Life boats, debris and survivors swimming. With the capacity to fire flares when they spot some vessel.
I want that the rain and snow match the direction and intensity of the wind.
Big warships should engage in a fight beyond the horizon. It is not real at all the 8 km limit.