I use MX Mariner for my Asus Transformer tablet and absolutely love it. It is every bit as good as the stand-alone plotters that West Marine sells for BIG $$$ (and can play a movie or a game of Angry Birds with you as well) Not sure if it supports charts for your waters, but for a $7 investment, I'd recommend giving it a try.
One note on smartphone / tablet chartplotters...they are only as good as your GPS capability, the accuracy of which can vary wildly from device to device. Most devices do not even include a GPS receiver (they get their location information through the cell phone signal using some technological magic I don’t pretend to understand). If you get out of range of a cell tower with one of these, you lose your GPS capability, and your chartplotter, altogether.
One way around this is buy a separate Bluetooth GPS receiver that you can sync to your device for a very accurate position fix in any location. I bought one through Amazon for about $70 and, although I specifically chose my tablet because it has a built-in GPS receiver, I keep it aboard as a backup.
Best,
Dan Resch
Sailorguides.com