[cyberhusky]

Maybe I'm missing something here, but computers and software and data limitations aside, if we are not supposed to interpolate between stations, what does your average bloke do actually on the sea with a paper chart?

Ron

That's what came too my mind too. It's true that tides/current almanachs show tides data for a set of hours (1,2,3 o'clock etc.) but you have to interpolate the time between these charts.

I think having a map showing tides/current arrows just gives an indication what to expect. This would simplify planning your trip, though you still have to check almanachs with tides and currents tables/charts.
The same goes for papercharts! I would never leave habour without them! Even if I have my iBook running and showing my position: I still refer to papercharts just in case.

Manou