Just back from sunny oz with a cautionary note. Navy Pier listed as one of the top ten dive sites is operated soley by a firm called Ningaloo Dreaming. Their Navy Pier operation is well equipped, briefed and controlled. The rest of their operations are very different. Please be cautious. Read all the small print and above all shop around for all your other diving. Of 12 on the dive boat to the Murion Islands (some with over 1000 dives under their belt) 9 had major issues with the firm. The next day was almost as bad.
If you are asking me about the Murion Island site rather than the company or the dive we did with them, I have to admit to being rather underwhelmed. Never did see the potato cod that were supposed to abound there but viz was only about 6meters. I've heard subsequently that its only ever about 12-15 meters at best. Seen more in the Lackshadweep Islands although the nudibranchs were plentiful. To be fair there had been a cyclone about 4 weeks before and the sea was still pretty stirred up... perhaps someone else may have seen it at its best and let you know more?
exmouth navy pier 
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