Baroun Tardis
SOC-12
Civilian aristocrat Marcus DeVol enters military service on a purchased commission as captain of Chimera - a battered, old destroyer with a bottom-dollar crew. Marcus must lead his crew despite his youth, inexperience, and self doubt in this sci-fi drama
I'm writing this about half way through the movie.
Chimera looks to be a 400-ton patrol cruiser, about TL10
There's a lot of "Master and Commander" feel to the way they wrote the script, along with a tablespoon of "Dune" when it comes to how the aristocrats seem to interact. The combination makes me think of the subsector navies