Thanks for the skype wheeze, Dan. I didn't suggest that it was possible to use as an alternative to a chartplotter, however, it's very good for planning/hypothesising when away from home and storing ones private marks on and being able to see them in context. O/k, I admit it, I'm a bit of a gadget tart! Tidal info is quite useful though with a bit of extra information to hand.
Terry.