I want to back up my chart plotter which uses Navionics (which, by the way, I have found surprisingly accurate). Most people I have talked to have an iPad (3G, GPS) and have the Navionics App which it is said works well. Clearly there are other devices on the market; i know Android also has a Navionics App.

Does anyone have knowledge enough to compare and contrast the two? Which should I buy?

There 's an interesting article in CW about a new set of charts (electronic and paper) created by NV that has more detail than NOAA charts for the US. They also have detailed charts for CUBA. http://www.cruisingworld.com/blogs/nv-charts-the-paper-digital-sweet-spot

Of particular interest is the note below the article indicating that these charts are available for direct download on Xtraverse.com for iNavX for iPad and Fugawi for PC. Does anyone have experience with NV Charts?

Vice Commodore, OCC