The Royal Tierran Navy forms the armed naval forces for the Unified Kingdom of Tierra. It's headquartered in the port of Northern Pillars and is commanded by the admiral who is also headquartered there, though it officially falls under the command of the king. It has a large amount of smaller ships used for patrol duties as well as several larger ships of the line. The Royal Tierran navy is the second best naval force in the world, outmatched only by the Takarans.
Unlike the army, the Royal Navy functions much more on merit, going so far as to allow baneless officers. This is the main reason why incompetent naval officers are so rare, being far less common than in the army.