cacluating ship speed manually

[I'm goin' down]

Originally Posted by I'm goin' down

Huh? Huh? (one for each post.)

How do you keep periscope at 0 or 180 degrees and just in front of the bow of the target without turning your boat or "twisting" the periscope. I assume "twisting" does not mean bending the periscope, but refers the act of of rotating or swiviliing iit. Just for fun, let's assume the target is a big, fat Yamato BB, plodding along at a meager 24 kts. . This I have got see! (...er, read.)

Originally Posted by TorpX

What he means is you would turn your boat so your bow is just in front of the target, you then have the periscope at 0 deg. (ahead), then you time the transit of the target past the wire, while holding the course and periscope steady. You can turn the boat and periscope before you start timing, but not while you are timing. The same goes for 180 deg. periscope view, because in either case the plane of the wire isn't moving relative to the target's course. If you are viewing the target at some bearing other than 0 or 180 deg., the plane of the wire is moving in relation to the target's course and must be acounted for to get accurate results. I hope this explains it better.

TorpeX MADE MY DAY! (Communicating in English is not easy, especially in technical matters. I see where I was confused.)