u had this same problem after installing OLC's GUI (which is awesome by the way) at any rate my solutions seemed flawless except for one thing ... Sometimes shots would miss well aft of target!!!
A real head scratcher considering I had taken so much care in plotting my calculations.
BUT******
Where I screwed up royally I discovered... In the situations where I missed astern I discovered that I had set my AOB 90 degrees in the wrong damned direction!!!!
I felt stupid!
So make sure you set AOB Appropriately to port or starboard as setting it on the wrong side will cause shots to miss aft.
For speed calculations- ID the target, set the cross hairs slightly ahead if target, when the front of the target passes the vertical line start timing... Stop timing when the stern of the target passes the vertical line. Now take the length of the ship divided by the time in second and multiply the result times 1.94... The result is the target speed in knots. I have found it is accurate to within a knot.
As far as I can say incorrect speed and poor AOB are the only factors that will seriously affect missing aft.
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