I'd check with the developers of ANW at the matrix forums to get specific answers to these questions as they're best positioned to answer.
Harpoon ANW doesn't do WW2 well mostly due to very simple gun and visual models which were important in that era. There is also a critical problem with scope as in you can't really zoom in enough to really capture short range duels etc. If you do choose to do it contact the WW2 database authors to see if they can give you some insights to make things work as best as possible.
If you can though choose an actually WWII naval sim.
Warship Combat: Navies at War is big and has gotten great reviews.
or maybe even consider several Matrix WWII Titles.