Course to steer - two hours of tide

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[@SCARTHYBOY692]

Could this be done for 3/4 hour tides assuming it’s flowing roughly in the same direction?

[@robcaine1658]

Yes. If you are travelling for 3/4 hour and the tide is running at 4 knots, you would use 3 nm as your current vector. You would then also have to adjust your CTS line. If your boat speed is going to be 12 knots and you will be traveling for 3/4 hours, you would measure out 9 nm for your CTS line.

[@smith1760]

What if you have 4 hours but the tide is changing every hour?