GJB 11190 is the Chinese national military standard that specifies the test methods used to verify the lightning protection of surface ships. A warship presents an unusual lightning exposure: the hull and the superstructure form a very large conducting structure, the masts and antennas are the highest points and are also the most sensitive, and the vessel carries a dense installation of electronic systems whose cables run along the full length of the ship. The standard therefore separates the tests for the direct effects of a lightning attachment, in which the discharge current passes through the structure and must be conducted to the water without damage to the hull or to any component in its path, from the tests for the indirect effects, in which the electromagnetic field of the stroke and the currents induced in cables couple into the electronic equipment. It defines the test current waveforms, the levels and the injection points, requires the verification of the protection of explosive and fuel systems, and specifies the criteria by which the installation is judged.