self-contained line-throwing appliance consisting of a plastic case with
an end cap and 250m of line , an integral striker mechanism plus a
rocket. Fired by a twist grip and used for passing a 4mm dia. line from
ship to ship and ship to shore or for rescuing a swimmer in distress.
Ships typically have to carry 4 units to comply with SOLAS regulations.
Projects a line to a nominal range of 250m in calm conditions.