For every tide station with daily tables in Ports and Passes, there are numerous secondary tide stations for which times and heights of high and low water can be found by applying a correction to a reference station. The same is true of secondary current stations.
Refer to page v in Ports and Passes or our online guide to learn how to apply the secondary corrections. Visit our Videos page to see the video version of the guide or visit our Resources page to view and download the Quick Guide PDF version.
If you have trouble locating a particular secondary station, refer to our Directory of Secondary Stations.