The process is simple and the more time you spend at it, the more detail you will get on your map. Within about a week the map will be updated on the Navionics WebApp for free for anyone to use. I wanted to share this if you are interested in seeing the map and learning about the process. This link will show you how to do it on various units. http://www.navionics.com/en/plotter-tutorial" onclick="window.open(this.href);return false;
Standard Nav Charts
Before sonar event

After sonar event
There were many other changes but I thought this one was pretty cool.

