position,channel,signal_code,revision,issued_at,message
1,coast,MAYDAY,4,2025-08-14T11:00:00Z,Request immediate rescue
2,coast,PANPAN,2,2025-08-11T07:00:00Z,Need harbor assistance
3,coast,SECURITE,1,2025-08-10T06:00:00Z,Navigate clear of buoy
4,air,MAYDAY,5,2025-08-13T08:00:00Z,Aircraft requires immediate aid
5,air,PANPAN,1,2025-08-15T17:59:59Z,Aircraft requests priority
6,air,SECURITE,7,2025-08-15T18:00:00Z,Airport advisory follows