it depends
It depends on whom you trust, what's available, and where you are. Underway, NOAA weather radio (vhf), is cheap and easy.Elsewhere, NOAA's still the best bet, unless you have hard facts to support another service which does better. NOAA/NWS/EMC (NOAA organizations) track how well its numerical models perform. So do other agencies (U.S. and foreign.) There are other services (commercial et al) in business. For real time winds, if you're in the Chesapeake area, it's hard to beat the Chesapeake Bay Observing System http://www.cbos.org/ . You may want to check for local services on the body of water you frequent.For real time radar, NOAA pretty much has the corner on the market, most other services you view, viz t.v., are value added onto NOAA's service.However, for real time weather support there's nothing that beats the MK-I eyeball, eyes, and brain. Best way to improve the brain's weather skills is to get out there on the water.two cents