advice on sailing around Cape Hatteras?
Personally I think that it would be foolish for anyone to think that they can accurately make weather predictions using OPC charts and gribs alone (no offense Auspicious, just my opinion) on a trip of more than 3 days across an ocean. If you have the means the input from a weather router can be invaluable together with your input to the router on the conditions where you are located.
Situations like TS Sean last year where even the professionals could not foresee the storm days in advance, the help of a router was invaluable for boats that were caught in the middle of it to get out of it. (With a couple of exeptions..,.)