Currently in order to support as many browsers as possible I need to use cookies for downloads from VentureFarther. If you have cookies disabled in your browser you will get a download error and will need to enable cookies. I am looking into other options but until then allowing cookies is needed (you should be able to make an exception for just VentureFarther if you would like).
This is basically the route in the Rocket Guide (the real Rocket Guide) with corners cut. I never saw less than about 470 feet. Use caution. The charts are terrible here (Navionics and cm93).