Once again .... NO THEY DON'T.

Now, so you understand .... IF it's a steam ship, after anchoring, they
will "spin" the turbines for a while and then put them on the "jacking"
gear to cool them, unless it's to be a short anchoring (in which case
they'll "spin" them to keep them warm). Naturally the boilers remain on
line since they are used for Hotel services.
Diesel electric: Depending on the setup, if the generators for the
engine are exclusive to the main propulsion, they will be secured.(same
with GT)
Straight GT: Shut down.
Direct drive diesel: (majority of larger ships) SHUT DOWN, PERIOD.

otn

JAXAshby wrote:
But you haven't seemed to grasp the fact that navy
ships and commercial ships do not "leave their engines running" while in
port.


but they do while "at anchor". check it out.