HBG Customer House Rule:
A patrol boat (also referred to as a patrol craft, patrol ship or patrol vessel) is a relatively small naval vessel generally designed for coastal defence, border protection, immigration law-enforcement, search and rescue duties. There have been many designs for patrol boats. They may be operated by a nation's navy, coast guard, police force or customs and may be intended for marine ("blue water") or estuarine ("green water") or river ("brown water") environments. They are commonly found engaged in various border protection roles, including anti-smuggling, anti-piracy, fisheries patrols, and immigration law enforcement. They are also often called upon to participate in rescue operations.
(more on Wiki HERE)
Patrol boats are a naval unit.
They may only be in a sea zone adjacent to a friendly or neutral territory.
They may choose to decline combat with any unit other than a TBD.
They may hunt subs without pairing with an aircraft on MAP.
They may carry special operations forces as if they were a kayak. (SOF)
They are chosen last in combat before only transports.
Patrol boats may engage in land combat by traveling up a river into an adjacent land zone.
They must return to the sea zone after combat is over.
Target select naval @1