Your visual spotting ranges doesn't seem to account for the fact that if you can see me, I can see you.
If the BB can see the MTB, the MTB can see the BB's mast
They do I'm afraid
If you look at destroyer to BB, it's 36km's
If you look at BB to destroyer, it's 36km's
They will see each other at the same time
Sorry, the advanced rules account for it, the basic rules don't. It's on page 5 of the thread. Or it's in the downloadable document.
I can't remember when HFDF came about, but simple DF sets small enough to fit on a small truck were available before the war.
Of course, you wouldn't know if it was just over the horizon or at the other end of the med.
Hmm... I don't know how I would represent that... Perhaps I would just have to role-play that... I certainly don't know how I would put it into rules, what with the range problem.
I don't know exactly how the system handles visibility, but a Nightfighter can only "see" ahead since its radar is fixed
That's not really a big deal. Aerial radar sets only reach 40 kilometres/20 nautical miles. Add the fact that most of the time, aerial sets will be handled by the bad guys, and they will be pointed at the ship anyway.