Had a few quick PMs about GRIB files, so I'll respond here.
GRIB (GRIdded Binary) files are the way that weather services distribute wind, temp, and seastate forecast data to computerized systems. The key part is the data is gridded for lat/long, meaning that you get micro-forecasts for every few miles. And you get this for days into the future.
This is KEY when going offshore. You can get a detailed few of what the wind is supposed to do. Most 3-day forecasts are very accurate. Whenever we go offshore, the LAST thing we do before casting lines is refresh our GRIBS.
Here's a shot of the Cyclades, from Athens to Santorini. That's a solid sail involving a night passage on most boats. You can see the detail of the breeze circling low pressure. Down one side of Kithnos, its a run. On the other side, a beat! I know which I'd go! Pressing the VCR control at the bottom advances time.