Are these all separate apps? I'm interested, as my Ipad2 is due to arrive in a couple of weeks. Never bought the first version.
Yes, these are separate apps. The Weather Underground looks like an app but is just a link to their website for my local marine forecast. Navionics and The anchor alarm don't need the internet to operate. I've tried InavX also but prefer Navionics. I believe one needs the 3G devices for GPS functionality but I think they make an external GPS antenna also.