Hey guys/gulls if you have a 3,5,7,8,9 or 11 series from Hummingbird you can do sonar logs (Making Charts Better)of those tough to get into areas. All you need is a blank SD go record and upload it to the navionics Freshest Data Program they will process it and it will be available in a few days to a week. IT"S FREE... You can see the results on any unit that can run Platinum products (I have heard once Nav+ comes out you can run it on the 3,5,& 7's as well.) Everyone always better charts. I will be doing Bascule Bridge Area around Lookwood Boats NJ in the next week or two. I will have screen shots.