Pax

The Pax is a small row boat owned by Camp Jupiter and is the only ship in their Navy.

The Son of Neptune
Before Frank, Hazel, and Percy go on their quest to free the god Thanatos, Percy argues with Octavian about how much supplies they will get. While Octavian wants to give them none, Reyna agrees to allow them to use the full force of the Roman Navy as traveling over land is dangerous. When the three reach the docks, the come upon a tarp with SPQR labeled on it. When they remove the tarp, they find a single row boat (without the oars) with the name Pax on the side, being the name of the boat. Percy uses his power over the sea to clean the boat and propel it forward toward Alaska, and eventually asks for the help of a Killer Whale to pull them to Portland.