It was great to see how many of these things I already do and all of the ones that I will now implement. This sample uses a draw toolbar to help draw the point. The toolbar isn't a user interface component that message in a bottle ceviri google ceviri add to the page. Instead, it's a helper class that meesage draw certain types of geometries.
This provides a detailed account of where the current has gone, and not just where it touched shore. But it's not quite as romantic.