ILCA By Laws
ARTICLE VIII – RACING RESTRICTIONS
PORTABLE EQUIPMENT
a) Mandatory
i)  Ground tackle shall be a fluke-type anchor weighing not less than 1.8 kg (4lbs) with 15.24m (50 feet) of line attached.  The line shall be 3/8 inches (9.525mm) in diameter.  It shall be made of Nylon or Dacron.  Exotic materials or polypropylene are not acceptable.  This line is to be a safety line to serve as towing as well as anchoring line.  Variation may be made only by specific written permission from the Chief Measurer when local conditions dictate.