How realistic is this movie with regards to naval combat, daily life aboard a man-of-war, the Napoleonic Wars, etc.?
You might be interested in one of these:
How accurately do movies such as "Master and Commander", portray naval combat in the late 1600- early 1800s? What was naval combat like from a crewman's perspective and was it really as deadly as the movies?
How accurate is Master and Commander's portrayal of 19th century naval warfare/life at sea?
Hope this helps!