The Administrative Regulations on the Ship Radio Station Article 14

Any ship radio station receiving alarm signal should immediately cease any transmission capable of interfering with the following communication of the aforementioned signal, and maintain a watch on the frequency carefully.If ship radio stations receive the distress call from ship, which is in their vicinity, and there is no response from the coast station, they should acknowledge receipt at appropriate time and transfer the distress message as well as inform the ship in distress of the responding ship's name and the estimate time of arrival to the site. If the responding ship is not able to go to the site of the ship in distress immediately, the responding ship should inform the ship in distress of the reason.