Add 6 hours using the ponce tide chart we provide.

Example:  If the outgoing tide says noon [means the tide will be done going out completely at noon], add 6 hours and it means in Oak Hill tide will totally be out at 6pm. It takes the tide 6 hours to make it to Oak Hill.

If incoming tide is says 1:00pm at Ponce, incoming tide ends at 7pm in Oak Hill.

Hope this helps.