WHY ARE SOME OF THE ENTRIES IN THE TIDE TABLES BLANK?
This is because the high water or low water turning points are slightly more than twelve hours apart. The exact time lapse varies with the cycles of the tides but it is always more than twelve hours. Thus, if a turning point (high or low) occurs, say, a few minutes before midnight the next one will be a few minutes after midday and the morning column will show a blank for that day. These are known as “crossovers” and they cause more confusion in the ISO format than they do in Lavers own.
