9D41 A
 Federal Communication Commission regulations for GMDSS specify that certain ships have a 406 MHz EPIRB capable of:
A. Floating free of a ship, in the event that it sinks, and automatically transmitting a 121.5 MHz homing beacon and a 406.025 MHz signal which contains a unique identification code for each EPIRB station.
B. Commencing transmissions after a 60 second delay only after floating free from a sinking ship.
C. Automatically activating when floating away from a sinking ship and transmitting on the 406 MHz band and 158.6 MHz.
D. Acknowledging reception by search and rescue by its flashing light.
