I've developed a simple web app to make it easy to plan and share details of your sailing trips. No software downloads required, as it runs in your web browser. Just copy and paste and URL to share the route with friends.
Full details:
blog.arribasail.com/2013/05/tech-chart-plotting-with-google-maps.html
It looks great, how do I trial it? Love to trial it on my trip from Sydney to Indonesia over the top of PNG.
Just fire up your favourite web browser and point it to http://www.nobletech.com/maps/chartplotter.html
Then click on waypoints to create your route.
Keep in mind that Google Maps is not a nautical chart, so make sure you avoid obstacles, such as reefs!