Yes, take 3 bearings from stationary position. Determine target course. Predict the 4th from stationary position. Move away from stationary position. (Often parallel course gets a nice crossing.) Take real 4th bearing from new vantage point and locate target at cross-bearing. All time intervals between bearings should be equal. So no 10,10,8. Then measure distance moved through bearings and triangulated position. Calculate speed based on interval.
(There are other 4 bearing methods that work in a different way and can be done moving all the time. See some PDFs in my lowest signature link. They have to be drawn manually on the map, Gutted's program doesn't work like that.)
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