[tedhealy]

Originally Posted by Captain Krunch

Here's mine, based on an actual one from 1943:

Sub Attack Course Finder

How exactly do you use this?

I've got A on the bottom, then B, then P, then C. Is this correct?

I'm not exactly sure which wheel should be pointing towards which bearing and where to read the AOB. Any help would be appreciated.

Edit: after messing with this, I think I've got it.

Line up your own true course on the B ring to 0 on the A ring.

Then line up the periscope wheel's tab to the A ring using relative bearing to target.

Then line up the C ring's 0 mark to the B ring at the target's course.

Then read AOB on the C ring at the opposite side of the periscope tab.

The portion of the C ring on the side where it says "ENEMY VESSEL" seems to be port, and the other side starboard.

Sounds kind of complicated, but it's actually quite easy to use....if I got this right. I'm just running through some easy examples and things seem to be working out.