[GPSNavX]

http://www.yachtingmagazine.com/article....1000081898

[AugustH]

"While many users term Navionics Mobile a "no-brainer" due to its gift-like pricing and easy track-sharing features, iNavX is the current king of the hill in terms of serious navigation because it can use the Internet to fetch weather overlays and what may be the world's largest selection of charts easily, and it can use a yacht's local WiFi to access its instruments, thus getting depth, wind, and a level of GPS much superior to what's built into the iPad or iPhone."