Navionics is a charting software I use on my Android devices for the last several years. With one subscription, I can use this program on any of my devices. I currently have it on both my phone and tablet. I also use the Navionics chart reader on my desktop
New Version:
Boating Marine & Lakes, US & Canada $29.99
Vector charts included in app, remain resident on device and function without mobile coverage. You download the charts for your area of interest.
Wind & tides* gives you a snapshot of your favorite locations including tides, currents, wind, sun/moon cycle.