A Google Groups post by Google Maps Brian announces the launch of Google Maps Maker, which is a "service that allows you add or edit features, such as roads, businesses, parks, schools and more." Only Brian forgot to add the critical parts: how do you actually get to Google Maps Maker? It isn't quite straightforward. Fortunately, Greg Sterling at Search Engine Land had the answer. By navigating to the Google Maps Maker documentation, you learn that it's not available to every single spot on the map and is instead available to places where Google lacks data (Bermuda, Grenada, Jamaica, Barbados, etc.)
Here's what it looks like when I try to edit the ocean around Bermuda:
Unfortunately, then, you can't even play with Google Maps Maker with your own "My Maps" (which I tried but failed at). But for a seasoned traveler of the Caribbean, this may be a fun tool.
Forum discussion continues at Google Groups.