Now let’s see how we calculate the times of high and low water in a secondary port. Let’s take Barfleur. First we have to look up which standard port is assigned to Barfleur, and we find it is Cherbourg. For Barfleur we want to obtain the time of high water in the evening. So first we look up the time of high water in Cherbourg. As we can see from the table, high water is at 18:46 and the height of the tide is 5.6 meters. We make a note of these figures.