This app shows the radio messages required in the SRC (Short Range Certificate) according to WRC-07 in GMDSS:

- Distress alert (Mayday)
- Mayday Relay
- Distress acknowledge
- Radio silence (Silence Mayday)
- End of distress (Silence fini)
- Distress cancellation
- Urgency alert (Pan Pan)
- Safety alert (Securite)
- Routine call

Ship name, callsign, MMSI, position, and time can be changed to achieve individual and customized messages.