This arrangement is for unaccompanied High D tin whistle (the most standard key of whistle that most players have). You could also use a low D whistle.

You receive the tin whistle parts in notation without fingering diagrams, the same part but WITH fingering diagrams (TAB), and a separate comprehensive fingering chart.

So if you enjoy playing the notes on the staff, there is a part for you! And if you need the diagrams for learning, or for using every time, there's a part for you!