The Navies of the Napoleonic Wars you are not likely to see in SOG.
The Kingdom of Italy
When Venice was added to the Kingdom of Italy in 1806 their small navy came too and in 1808 the Kingdom of Italy's navy consisted of 3 frigates and 6000 personnel. Somewhat bloated with personnel and short on ships the road to promotion must have been interesting indeed.
Naples 1806-14
After the occupation of the region by France, Joseph Bonaparte was made King, later replaced by Murat when Joseph was "promoted" to King of Spain, a posting he did not want. The Navy of Naples at this time consisted of a handful of sloops and gunboats although a battalion of Marines of the Guard was also raised. Murat ensured all the crews and marines were smartly dressed as was his want, being a fashionista from way back in the Revolutionary days.
Prussia
With a large merchant fleet (the Hanseatic League) but no history of naval power, the various Frederick's having been pre-occupied with creating the greatest army in Europe, Prussia had no navy worth mentioning. There was a small coastguard to enforce the Continental system imposed by Napoleon, but the effieciency of that can be easily guessed.
Source: Navies of the Napoleonic Era by Digby Smith 2004. ISBN 9780764319884