GPS

I have Navionics loaded on mine, but its really just a toy, not a primary method of navigation. Works well enough, position agrees with my Garmin on board kit to about 5 meters. (Dont know if the anomaly is caused by the tablet or the charts)

Difficult to see in bright sunlight and very little water resistance (Dont ask how I know :( ). Fantastic bit of kit all round but better for plotting courses on the sofa than at sea.
 
I had Navionics installed on my Galaxy Tab 8.9. I agree with Mark. Great for dreaming about possible voyages. Use a Garmin on board.
 
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