Decent tidal information. I would really like to be able to click on a tidal reporting station and see an ebb and flow graph where I can slide to see what the tide will be at a certain time.
For example, at my boat launch I need at least a 5.0 tide to be able to use the launch, so being able to see exactly when I will have tide, or when the tide will be below my minimum requirement would be very useful.