As the autospeed finder is currently broken in the manual TDC in SH4 then i use Kim Rønhof's Course Calculator Mark 4B.
With that one you can find a pretty close match of the targets speed by:
1) turning so you have the target on bearing 90 or 270
2) estimate AOB
3) plot AOB with the marker, figure what Sin(AOB) value that is (scale d).
4) match your own speed on the inner wheel to the Sinus(AOB) scale that is the most inner one of the two.
5) Read an estimated target speed at the big triangle with the text "Speed 1" on the inner scale.
Fast and more precise then what els i can come up with. It is ofcourse more precise to plot a couple of plots and read it off that, but sometimes you just dont have the time to plot.....
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