I use Navionics
on my Samsung Galaxy Tab, and have found it to be very handy. When I compare it to my Garmin
charplotter they seem to agree most if the time. While the touch screen is handy for planning, and looking ahead on the charts
, I certainly would not use it as my primary navigation tool. It is purely a back up to the Garmin
with it's external antenna and hardwired power. The tablets are a bit too fragile! When the wind picks up or the weather gets bad, the tab goes away!