I've been looking for a C-Map cartrige for nantucket sound and since they are not made any more I figured I would ask around. I have a raytheon raystar 198 but can't seem to find any charts for it. Anyone have any lying around or know of a good source. I would like to find a place that stocks used ones. C-Map sells them for $100.00 but they haven't been updated since 2000 so they aren't going to be that accurate considering how much the shoals move around out there. Thanks.