hmmm
Historicaly correct to use Km's - yes i'd say so. The calculations they did at the time is by using Km's and you dont need to convert it.
ex. plot contacts with 3 minutes 15 sec. interval - the plot will show the speed of the target by measuring the range between plots and multiplying the kilometers with 10.
Example the target plots out to have 0.500 km's between plots - aka 5 knots.
Range to the TDC - Kilometers
length of ship in the recognitions handbook - meters
No need to convert anything.
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