EarthNC Marine Charts for IPhone
Forecast: You’ll get the full gamut of NOAA coastal and Great Lakes charts for the United States, plus inland waterways charted by the Army Corps of Engineers. The charts update every seven days and, for the weather junkie, provide real-time marine weather and tide information. The app has a NOAA radar overlay function so you can watch weather patterns over the charts.
Dark Cloud: Pricey if your main interest is quick weather. The main function is navigation.
Numbers: $19.99; earthnc.com