46 CFR §199.170

1. (a)General. Each vessel must have a line-throwing appliance approved under approval series 160.040.
2. (b)Stowage. The line-throwing appliance and its equipment must be readily accessible for use.
3. (c)Additional equipment. Each vessel must carry the following equipment for the line-throwing appliance—
   1. (1)The equipment on the list provided by the manufacturer with the approved appliance; and
   2. (2)An auxiliary line that—
      1. (i)Is at least 450 meters (1,500 feet) long;
      2. (ii)Has a breaking strength of at least 40 kiloNewtons (9,000 pounds-force); and
      3. (iii)Is, if synthetic, of a dark color or certified by the manufacturer to be resistant to deterioration from ultraviolet light.