You can plan your on-the-water adventures, check tides, set your routes and markers, and search for marinas. Record your track, capture geo-tagged pictures (iPad2), and create a virtual adventurelogue of your entire trip and then share it with your friends and family via email, Facebook, Twitter and the Navionics community.
Navionics Marine Navigation Software for Mobile Devices
http://www.navionics.com/en/mobile-pc-app-1