"Captain's Bed" is a leftover from SH3 and probably works for the U-Boat add-on to SH4 (I can't be sure ... for U-Boats, I still prefer SH3). When the key is active, it moves your point of view to wherever the bed is located. (Notice that, when you right-click from the bed, it takes you back to the radio room.)
As for the others, you got it right.
