Thanks for the tips everyone....
I've been using to get target speed during daylight hours without contacts based on a method based used by US subs during WW II.
I have the better smoke mod so can usually see the smoke for miles like in RL.Read in many books by O Kane etc that they used high periscope to watch the smoke and keep track of them with only sporadic use of radar since they were not sure if IJN had radar warning equipment.
So I get on a parallel course and keep track via the smoke from a distance and guess the speed once i began to pull ahead, then when close in may refine estimate if needed, works pretty well during daylight and have had success.No real reliable method for getting speed at night yet but will try some of the suggested methods.
Hopefully when we have better radar come along it will help.
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