I also use Windguru for sailing although I always make allowances for wave height particularly when influenced by land.
I shall try out some of the apps suggested as weather radar can't not but help accuracy.
One point that may be of interest to some is that when using the BBC and Met Office websites, I use Abersoch rather than Pwllheli (my home port) for the local weather. I suspect that they use data for Snowdonia for Pwllheli and Abersoch seems more representative.
