You can get a pretty good idea of the target's course from the first three bearings taken using the "four bearings" method. Probably 80% of the time that works ok for me, although it requires you to sit motionless and track the target for quite a while, which may cause you to miss out on a firing opportunity.
If you also make an educated guess at target range, the you can get a good first approximation of speed.
All measurements can then be refined after you begin actively tracking the target.
The fourth bearing, which should provide range and speed has never worked for me.
If you have vector math and trigonometry skills, you could probably solve it mathematically. I have created spreadsheets on my ipad that substitute for my missing crew.
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