California Code, Fish and Game Code - FGC § 7853

(a) Within 500 yards of any vessel owned or operated by the United States Government or any department or agency thereof, except when necessary to comply with the laws or rules of navigation governing the safe movement of vessels;  or

(b) So close to any vessel owned or operated by the United States or any department or agency thereof and engaged in transporting naval or military equipment or personnel as to interfere with such transportation or to enable the observation thereof, except when necessary to comply with the laws or rules of navigation governing the safe movement of vessels.