What sensors should I use for a ROV project

Hello Everybody,

A friend of mine started a ROV project and asked me for help with the "brain" of the ROV.

This ROV will be controlled using 2 joysticks and an Arduino UNO board at the surface.

It will have a GUI displayed on a LCD screen, and we would like to get those datas from the ROV:

Compass heading, Attitude, Depth, battery monitoring

The control box will be tethered to the ROV using arduino's board serial ports.

I was thinking first of using an APM for that, but it might be overkill and I decided to go for an Arduino Mega, on which I'll plug: 

Compass shield, Accelerometer and Gyros shield.

My question is, what would be the best choice?

Would it be good enough if I choose:

Compass: https://www.sparkfun.com/products/10530

Accelerometer: https://www.sparkfun.com/products/10345

Gyros: https://www.sparkfun.com/products/10612

Or something like that would be good enough? http://www.pololu.com/catalog/product/1268

Thanks for your advices

Have a great day

Alain

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