[AugustH]

it's a common misperception that stations that have tides can have currents as well. There's a page on the AyeTides website that describes the difference, I'll have to add a similar page to the Mr. Tides web site, and add a page to the Help file as well:

A reoccurring question is the difference between tide stations and tidal stream (current) stations. Tide stations do not show currents, and current stations do not show tides.

Think of the difference this way. Tide stations measure the depth of the water at a location, irrespective of how fast the water is moving past that point. All the tide station cares about is the depth. Meanwhile, a current station is only concerned with the speed and direction of moving water. Depth is irrelevant, and the current is only measured at the surface, or just below the surface.

You can have a tide station measuring a large change in the depth of the water, even while a current station next door measures no current at all. Alternatively, a tide station can have no change in depth while the nearby current is running hard. It all depends on where the water is coming from and where it's going to.