What will be the velocity of the tidal current at Port Royal, VA, at 1505 DST (ZD +4) on 4 June 1983?

Correct Answer: Option C — 0.4 knot

Extracting data from the NOS Tidal Current Tables requires adjusting the user's Daylight Saving Time to standard time, applying table differences, and referencing the secondary station correction factors to find the exact current velocity.