I will leave the longer explanation for another time, but this is what i use to make my cruising decsions.
Click Here for Wind Map
You can click at a particular point and it will give you the speed and direction.
So what I am looking for now is the light winds between Denmark and Sweden for two days and then the easterlies that are becoming stronger on the third day.
The KK does well in a following sea, so I will take that and get to Norway.
Then as you can see, I must wait until the high and.or the low move, because those strong winds in the North Sea are being caused by the low pushing into the high (or vise versa).
Now, if you think you get more detail for whenever you are getting your weather forecast,
You're not. What you are getting it an interpolation of this wind, temperature and pressure field. It can look more detailed, but it's not.