Photos/specs needed of rotating hydrophone head

[Rick]

If you think about it,  all you have is a straignt microphone.  as sound travels through any medium I think that the only change you would be able to detect are in distance and pitch of the sound wave.  A well trained sonar tech would know the difference.  Nick also explained that thes mic's were ultra sensitive.  That would be understandable as you would need this in a denser medium (like water) that would atinuate the sound wavelike water

Thank you Bill Nygh the Science guy 

[Mark Sarsfield]

I'm guessing that they listened in on the officers, a lot, while they were on deck watch.  Wanted to know where they were going and what-not.

[Rick]

That's my impression.  This may be a little tidbit that can be worked into furture tour events....