I am looking for an app that I can use on my phone to navigate on unfamiliar lakes and rivers in my area. I don't really need depth charts and all that but would be nice. I am more interested in just a map of the lake or river and the ability to plot waypoint and a course and map it and have the app guide me back the way I came. I checked out the Navitronics app, but that is more than I need/want and I don't want to have to pay anything if possible. Just something simple and hopefully free.