 The term boghammar, sometimes spelled boghammer, has also come to mean an improvised naval fighting vessel, typically used by a local irregular military force and usually being a modified civilian boat or other similar machine.It is usually a speedboat or fast patrol boat (as used by police for harbor/river patrol) on which are mounted recoilless rifles, heavy machine guns, mortars, or other relatively small weapons systems.A boghammar is usually unarmoured.