The information must be sent to ships in the vicinity and to the nearest coast station or signal station with which it is possible for the ship to communicate. If such station is a signal station, the information shall be accompanied by a request that it be sent forthwith to the nearest coast station. If the ship is not equipped with a radio apparatus and it is not possible to communicate with a signal station, the master must as soon as the ship returns to port, furnish a report to the relevant authority.