Dangerous. Said of a weapon, means such as is likely to cause death or to produce great bodily harm. See further WEAPON. Dangers of navigation. The ordinary perils which attend navigation.1 Includes dangers arising from shallow waters at the entrance of harbors; 1 also, unavoidable dangers from a bridge across a river.2 Dangers of the river. The natural accidents incident to river navigation; not, such accidents as may be avoided by the exercise of that skill, judgment, or foresight which are demanded from persons in the particular occupation.3 Includes dangers from unknown reefs, suddenly formed in the channel, and not discoverable by the use of care. Dangers of the sea or seas. Stress of weather, winds and waves, lightning, tempests, and other extraordinary occurrences, as understood in a marine policy; not, the ordinary perils which every vessel must encounter.5 Accidents, peculiar to navigation, of an extraordinary nature, or arising from an irresistible force or overwhelming power which cannot be guarded against by the ordinary exertions of human skill and prudence.6 All unavoidable accidents from which common carriers, by the general law, are not excused unless they arise from the act of God.7 The phrases "dangers of the sea," "dangers of navigation," and "perils of the seas," employed in bills of lading, are convertible expressions. See further Аст, 1, Of God; PERIL.