The OP asked me to comment here, so here goes.  The question comes in two halves, is the vibration caused by the propulsion at high speed, and can it vary on where in the ship you are.   First, yes, it is most likely propulsion caused.  Correct me if I'm wrong, but all Azamara ships are conventional propellers, right?  Propulsion vibration is caused when the tip of the propeller blade passes closest to the hull of the ship (at the top of the propeller swing).  Depending on the clearanc
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