BTW I know they don't work on Humminbird (at this time but maybe one day) there are Community Edits. These currently appear on Lowrance HDS, Simrad, and Raymarine. These are fishing locations, restaurants, under water structures, tips, marinas, ramps, piles, rocks, trees, etc... that are added to the chart under a separate layer. They are added via the smart phones on Navionics app and then through Freshest data appear on charts. Good way to find local data.