I just did the Exumas on a new boat with the Simrads mentioned, and I bought a Navionics+ chip for Central and South America which includes the Bahamas and Florida in the coverage area. Well, the chartplotter shows only about half (if that) as many soundings as the Garmins that have been on the yachts I've been running lately, the other issue I've had is the shading sucks, like 3 shades of blue between 20ish', 10' and shallow. Also, there were a lot of erroneous readings showing a shallow sandbar near several islands in the Exumas (between Highbourne Cay and Staniel Cay) that simply did not exist compared to my paper Maptech chartbook as well as the Garmin bluechart in my Ipad mini...….and by watching a 100' yacht transverse right over one of them and me doing the same afterwards based on double checking both my Garmin app and paper chart (West side of Shroud Cay for example). SO, what electronic chart is everyone using? CMAP? Navionics? or what for Simrad chartplotters? ALSO, is Garmin taking detail out of the Navionics chart chips for non Garmin products, as they now have chips only for Garmins, and other chips for everything else?