Navionics charts are available through the app store.
I have them on an Android, but I would not use that as a principle mode of navigation.
I also have some weather apps that I like.
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)