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How can I take the right mesurements of the distance if I can't use the SH3 internal system mesurement due the boat move all the time ?
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If you use the "fixed wire" method of attack, range does not matter.
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How can I identifie a ship by night if I can't see absolutly anything ?
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You can't.
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Is SH3 100% realism mod reserved to play by daylight and quiet sea ?
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Well, if you come across a convoy, odds are
pretty good that it's an enemy convoy, or at least contains enemy ships. This is not a guarantee, however.
If you come across single ships, you can usually have enough time to get in close enough to see, or, as was said, take a shot at it with your deck gun and see what happens.
Also, be aware of where you are sailing. If you are off the coast of Norway, you might see friendly or neutral ships. If you are off the coast of England, it's more likely that you will encounter English ships.
Fixed Wire Attack
1) Point sub and periscope 000 heading and bearing just in front of target ship. This negates the effect of submarine speed on target speed calculation.
2) As bow of target ship crosses vertical reticule, start stopwatch.
3) As stern of target ship crosses vertical reticule, stop stopwatch.
4) Identify ship in Recognition Manual. Manual tells you ship length.
5) Calculate target speed using: (Ship Length in Meters * 1.94) / Time in Seconds.
6) Go to TDC. Enable Manual Data Entry. Set Angle on Bow (AoB) to either 90 port or starboard, depending on which side of the target ship you are. Set speed as determined in step 5. Turn off Manual Data Entry.
7) Go to Periscope/UZO. Turn scope until gyro angle reads 000.
8) Go back to TDC. Turn on Manual Data Entry. Tweak AoB back to 90 degrees. Turn off Manual Data Entry.
9) Go back to scope. Tweak scope until gyro angle reads 000.
10) Go back to TDC. Confirm you are still at 90 AoB. If not, repeat steps 7-10.
11) Drive sub to course 90 degrees to target track. Open tube doors.
12) Wait for target ship to cross vertical reticule when scope is at 000 gyro angle. Fire torpedoes.