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Originally Posted by rdhiggins
Y
Next I place the periscope or TBT crosshairs in front of the vessel by the water line until the vessel passes into the T of the crosshairs. Then I click on the stopwatch or chronometer. When the vessel clears the T then I click on the stop. Based on the seconds I have an estimate if I believe it is going fast, medium, or slow.
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You posted "based on the seconds". Can you share what numbers of seconds you are using to estimate what speed please?
This sounds like a good technique to use and I would truly like to understand it.