Zero gyro shooting

[BigWalleye]

Maybe the point of confusion is that the intercept angle in Dorjun Driver's original diagram is NOT the track angle, but 180-the track angle. And what is marked as "theta sub track" in DD's second diagram is actually the intercept angle, again 180-the track angle. Track angle - whether ownship track angle or torpedo track angle - is equal to the AoB at the point where the tracks intersect, either ownship track and target track or torpedo track and target track. In either case, the intercept angle is 180-(AoB at intercept). I'm pretty sure Dignan will get the correct result if he uses 180-Track angle in his calculations. And DD's formula is correct for intercept angle not AoB and not track angle.

BTW, I believe that what is marked as "theta sub torpedo track" is in fact the torpedo track angle. It is only "theta sub track" which is on the wrong side of ownship track line.

Or I'm trying to figure this out too late at night and have it all wrong....

"I'm getting too old for this ****"! - Danny Glover, Lethal Weapon

Further clarification: Please see the diagram on Page 1-12, SLM-1.