finding masking boundary indices

[Sudheer Joseph]

Hi,
           I have a masked array like in the attached link, I wanted to find 
indices of the bounds where the mask is false ie in this case of depth file 
where there is depth less than shore. Is there a pythonic way of finding the 
boundary indices? please advice?
https://drive.google.com/file/d/0B3heUQNme7G5d2dYZzgxTG1NdG8/edit?usp=sharing
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