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Passing at High Water Slack means whichever way you go you will be cruising against the tide meaning slow progress and using more fuel. Low water slack is the best advice you heed. I have recent gone from North to South, arriving at GY at LWS . The cruise down with the outgoing tide was a pleasure and the boat was virtually on tick over speed. The aircraft was 8'2" and I went under the bridges with plenty of room.