7.1 C1 Message priority – C1 = 2 (urgency) 7.2 C2 Service code – C2 = 13 Coastal warning C2 = 31 NAVAREA warning 7.3 C3 Address code – C3 = two digits X1X2 When C2 = 31 then: X1X2 are the two digits of the NAVAREA number (with a leading zero where necessary in the range 01 to 21) C3 = four alphanumeric When C2 = 13 for coastal warnings then: characters X1X2B1B2 X1X2 are the two digits of the NAVAREA number (with a leading zero necessary in the range 01 to 21) B1 is the coastal warning area A to Z B2 is the subject indicator and must always be A or L, where: A = Navigational warnings L = navigational warnings 7.4 C4 Repetition code – C4 = 16 Broadcast every 12hours with no echo until cancelled 7.5 C5 Presentation code – C5 = 00 The code 00 for International Alphabet Number 5 is normally used 8 Date/time should always be quoted in the form: DDHHMM UTC MoMoMo YY as in the example: 251256 UTC JUN 17 Note: UTC (Coordinated Universal Time) is the same time-zone as GMT (Z). 9 Geographical positions should be quoted in the standard format: D1D2M1M2LaD3D4D5M3M4Lo where: D1D2 = degrees latitude (with leading zero if required) M1M2 = minutes latitude La = hemisphere (N or S)
7.1 C1 – Message priority C1 = 2 (urgency) 7.2 C2 – Service code C2 = 13 Coastal warning C2 = 31 NAVAREA warning 7.3 C3 – Address code C3 = two digits X1X2 When C2 = 31 then: X1X2 are the two digits of the NAVAREA number (with a leading zero where necessary in the range 01 to 21) C3 = four alphanumeric characters X1X2B1B2 When C2 = 13 for coastal warnings then: X1X2 are the two digits of the NAVAREA number (with a leading zero necessary in the range 01 to 21) B1 is the coastal warning area A to Z B2 is the subject indicator and must always be A or L, where: A = Navigational warnings L = navigational warnings 7.4 C4 – Repetition code C4 = 16 Broadcast every 12hours with no echo until cancelled 7.5 C5 – Presentation code C5 = 00 The code 00 for International Alphabet Number 5 is normally used 8 Date/time should always be quoted in the form: DDHHMM UTC MoMoMo YY as in the example: 251256 UTC JUN 17 Note: UTC (Coordinated Universal Time) is the same time-zone as GMT (Z). 9 Geographical positions should be quoted in the standard format: D1D2M1M2LaD3D4D5M3M4Lo where: D1D2 = degrees latitude (with leading zero if required) M1M2 = minutes latitude La = hemisphere (N or S)
2017.06.02-Iridium_Global_Satellite_EGC_Manual(Without%20Video)-Draft.docx