I can't answer your first two questions, but the next two I can.
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Originally Posted by Zky
3.
Is there any other boat's then the one you get from the beginning that you get later in the campaign where there is any difference in look and other characteristics (dive time etc).
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Yes, the newer boats are different, and better. One of the hallmarks of SH5 is the fact that each boat is shown, outside and inside, and the differences are there. Later boats are faster, dive deeper and carry more torpedoes and better equipment.
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4.
And where is those areas that the bdu and Fdu sends messages. Example of message "Courageous destroyed. U-29 homebound. BE 3198" So where is area BE 3198?
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Ah, the Kriegsmarine grid coordinate system. The Germans created it and used it so even if the Allies intercepted their radio transmissions they wouldn't know where the u-boats were.
Aces Of The Deep had it, and the cursor would show the exact coordinates wherever you put it.
Silent Hunter 2 had it.
Silent Hunter 3 had it. Sometimes SH3 would have real messages of ship sinkings, but no one knew where they were because the Allies used the latitude-longitude system. The other complaint was that it only got as fine as the two-digit base system: AF11.
Silent Hunter 4 U-Boat Missions had it. In fact, SH4-UBM had both, and the KM grids get finer and finer as you focus in on the map. At close zoom levels it gives the whole 4-digit location.
Silent Hunter 5 doesn't have it. Why they saw fit to leave out the main system of communication the Kriegsmarine used, I don't know.
Anyway, here's how it worked:
http://uboat.net/maps/grid.html