I don't know how new this is, but it's exciting news to me and my fellow sailors, so I'll share.

The National Oceanic and Atmospheric Administration (NOAA)'s National Data Buoy Center has published an interactive online map of 1003 stations (at press time), providing near-real-time marine observations such as air and water temperature, wind speed and direction, wave height and period, and much more. These data have long been publicly-available in other formats (web, text-only, or by phone ("Dial-a-buoy")). But the map interface makes searching for and comparing marine data a breeze.

The National Data Buoy Center uses Google Maps.

Hat tip to fellow sailor, planner and GISer Kelly Robinson.