Now that the iPhone has been surpassed by Android platforms in terms of overall sales and users, it’s no longer a given that every app will come out in an iOS version. Here are a few Android apps that I use, hopefully there will be a iOS version or one will eventually come out.
Navionics – Works great and very cheap for what you get. You can get the US and Canada maps, USA only is like $10. Really a good app for what you get and you can (and should) download maps to memory so you don’t need have data signal to use the app.
Intellicast – Probably the most versitle app I’ve found for weather. Good maps, and easy setup so you can have miltiple “areas” pre set to quickly access the weather in different places. Lots of featrues beyond just simple radar, which almost everyone offers.
Grouse