I have the chip you describe and the detail is excellent. I used it in a Lowrance Chart plotter. As noted both Navionics and C map have decreased their prices and upped the coverage recently. I have a plotter of each C map, Navionics and the G2 Garmin--so far I rank them in that order, with C map being the best. However ask each chip maker for their charts of the areas to San Blas Islands off Panama--and see how much detail is evident in those charts. To get the best out of Navionics charts is to have a chart plotter. I favor Lowrance if you don't have Furuno Nav Net. The Lowrance chart plotter is in-expensive and would be a good backup, if you decide to go with the Navionics charts. The new Hard drive chart plotters are useful if you are going to do a lot of coastal US voyaging. I have both Lowrance --Nauticapath--which are basically NOAA charts, and Garman, with the G2 charts on the hard drives. Bob Austin