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Thank you everyone for the tips. I'm currently warming up my own way of targeting 
When I feel strong about it I may want to try other ways
BTW in the recognition manual I noticed there are some ships twice there and only difference could be seen in mast hight and/or draught value. So how should I know which to use when geting ship ID ?
There isn't a way to know which to use. I think it was done to make the game more realistic since this occurred in real life. Generally the mast height difference is only 1 meter. As far as the depth I would always assume the shallowest because you wouldn't want to try a magnetic and have it set 3 feet too deep.
Most commonly this occurs with destroyers. The general rule for destroyers is to use 25m for the mast as they all tend to be 1 or 2 meters from 25m. This will allow you to be accurate enough to plot their track and save time because you don't need to flip through 20 pages to figure out which DD it is.
Ironically I intend to do a manual targeting tutorial with illustrations. Yea there are plenty available but each one is a bit different which helps. I was starting to take screens for plotting a target in rough seas when this DD shows up out of no where and I had to rush my attack so my tutorial got side tracked.