You can also learn the 4 bearing method to find out everything you need in one method, but it takes quite a bit of map work and will take some commitment learning it.
A really long time ago when I used to play SH3, and this was before I switched to realism mods and used to have all the map info active. I remember using a method where you would mark the target on your map, then start the stop watch and mark the target again after 3m15s. you multiplied or did something with the distance it traveled in this time to get its speed. You could look this method up.
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