 Usually, PL (Patrol vessels, Large) have only a navigation radar and a single-mounted 35 mm or 40 mm autocannon.And the JM61 20 mm Vulcan on the single-mounted remote weapon system later became a model for the 20 mm RFS (Remote Firing System), which is on modern PMs and PSs such as the PS.The OPS-14 2D air search radar is the Japanese counterpart of the American AN/SPS-49.