Coastal Skipper and Yachtmaster Quiz · Tidal calculations
Using this table, at what time is today's high water at the secondary port?
A table of high water time differences for a secondary port. When high water at the standard port is at 0000 or 1200, the difference is plus 0020. When it is at 0600 or 1800, the difference is plus 0050. Caption: today's high water at the standard port is at 0900.
Show the answer
0935. The time difference depends on when high water falls at the standard port, so you interpolate between the columns. 0900 is halfway between 0600 (plus 50 minutes) and 1200 (plus 20 minutes), which gives plus 35 minutes: 0935.
