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I recently invested in a C-Map Max N+ card with their new Reveal layer - one of the guys in my club had sent round a Whatsapp image of his plotter showing some amazing images of the sea floor so I wanted to see for myself. I consider myself a Navionics fan because of their detailed contours, but the C-Map Reveal sea floor interpretation takes this to the next level. This first image is just south of the Owers, off Selsey Bill. That great big hole shows up nice and clearly, including the steep face of the NNW wall of the hole. Got to be worth a drift over that. And below is a close up of the wreck from the image above. Here's an image of a wreck that I had marked on my plotter already showing good correlation between my bow and stern marks and the underlying sea floor mapping. I reckon C-Map have licensed some of the sea-floor mapping data from the DORIS site as the C-Map coverage (or rather the gaps in coverage) of the St Catherine's Deep area are pretty much identical to DORIS's, which can't be a coincidence. The Reveal layer could be a great way to find that little patch of unfished rough ground that doesn't show up on a regular chart. I already have a few marks picked out in my neck of the woods to try out. The card I bought covers the south coast and most of the east and west coasts. I've yet to take a look at the coverage of Poole Bay and surrounding area but will post up some images shortly. Anyone have any requests for places they want to see?

Help. When I bought the boat, it came with a Lawrance Elite 5 chart plotter but no SD card. I contacted the guy I bought it from who said he would look to see if he could find it, but hasn't got back to me. So the question is, can I get a replacement card from somewhere? I assume buying a Navionics Gold card would be useless without the supplied basic card. OR do I just give up and save for a complete new one? Garmin looks good but expensive. OK just had a message from Lowrance in America. it doesn't come with an sd Card, so where do I buy charts on a card for southern England?