Chiglet:
Merchant Marine vessels:
If the Master was a ex-Navy sailor with Captains rank = Captain or Master.
Civilian only = Master or Skipper.
The Pilot may be Captain or Master qualified, but doing pilot duties only on a ship. he is not the "Master."
However I have only served in 2 nations Merchant Marine's, yours may be different.
The same rules are loosly applied in the airline business, yet most Pilot's in Command
are called Captains. (Commanders in some European countries.)
My official tittle while in the left seat of big jets was "Flight Officer" as per my ID card. Per the FAA it was "Pilot in Command",
my First Officers usually said "Captain".
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Men, this is no drill...