He's talking about waterborne fights, though any fight involving a Monitor would probably be a brown or green water fight, they don't look like the kind of boats to handle true blue water deployments, unless 31st-century river barges are a lot more ocean-worthy than they look.
If you want a good naval fight, try to find the Battlecorps story Blue Waters, a two-parter by Steven Mohan. It's a story of the Periphery Star Guard mercenaries guarding an Interstellar Expeditions operation to salvage a submerged DropShip, and most of the combat action focuses on their naval detachment. At the least, they possess a Mauna Kea, a Monitor, an unstatted sub, a Silverfin hydrofoil, and an unstatted hydrofoil. By description, the sub sounds like a Neptune by another name, and the foil is likewise probably an off-brand Sea Skimmer. They end up going against mechs and hovers.
If you want a good wet-navy