AyeTides XL offers a map as the main way to select a station.
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You'll notice that the stations also list the current value of the tide or current. You can see at a glance what is happening at the stations you've recently opened.
Symbols with a T in them are tide stations; those with a C are currents stations, and the numbered locations have multiple stations in the immediate vicinity. Clicking on them brings up a list that you can choose from.