As stated above, if you have time, plot the ships position on the map, wait either 3 or 6 or 30 or 60 mintues and then plot the position again. the speed is roughly:
3 minutes: 20Xdistance=speed
6 minutes: 10Xdistance
30 minutes: 2Xdistance
60 mintues: 1Xdistance.
Any of these will give you a halfway decent estimate of speed. Obviuosly, the longer the time, the more accurate the estimate.
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Guess I should change my sig since SH5 has an offline mode now 
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