For an OSV not on an international voyage, an approved substitute for an impulse projected type line throwing appliance is a __________.

Correct Answer: Option C — shoulder type line throwing gun

For OSVs not engaged in international voyages, 46 CFR 133.80 allows a shoulder-type line-throwing gun as an approved substitute for the impulse-projected type. This equipment must be maintained in good working order and ready for immediate use to facilitate emergency line-carrying operations between vessels or to shore.