In order to get speed of a target you need the range and bearing. Convert bearing to bearing due north (bearing to target + your course = bearing due north. -360 if over 360). Mark your position on the map, then the enemy's position given bearing and range by drawing a line from your position along the bearing due north. Press the stopwatch the moment you get the target information and mark your position immediately if you are moving. Wait 3 minutes and 15 seconds and repeat the process. Once you have marked the enemy's position again draw a line between the two marks. Waiting 3:15 means that every 100 metres travelled by the target represents 1 knot. So the distance between these two plots of the target's position is the target's speed. It's actually pretty easy with a bit of practice.
Read Wazoo's for a description with pictures.
__________________
|