(a) The acknowledgement of receipt of a radiotelegraph distress message is transmitted in the following form:

1. (1) The distress signal SOS;
2. (2) The call sign of the station sending the distress message, sent three times;
3. (3) The word DE;
4. (4) The call sign of the station acknowledging receipt, sent three times;
5. (5) The group RRR;
6. (6) The message signal SOS.

(b) The acknowledgement of receipt of a radiotelephone distress message is transmitted in the following form:

1. (1) The distress signal MAYDAY;
2. (2) The call sign or other identification of the station sending the distress message, spoken three times;
3. (3) The words THIS IS;
4. (4) The call sign or other identification of the station acknowledging receipt, spoken three times;
5. (5) The word RECEIVED;
6. (6) The distress signal MAYDAY.