What will be the velocity of the tidal current at Port Jefferson Harbor Entrance, NY, at 1600 EST (ZD +5) on 23 December 1983?

Correct Answer: Option B — 1.1 knots

Tidal current velocity is determined by applying time and velocity differences from the National Ocean Service Tidal Current Tables, accounting for daylight saving time or standard time adjustments and interpolating intermediate rates between slack and maximum flood or ebb as outlined in Bowditch.