Alerting, SAR operations, maritime safety, distress and safety, and survival craft frequencies

 

Function

 

System

Frequency

Alerting

406 MHz distress beacon

406-406.1 MHz (earth-to-space)

 

 

 

Inmarsat SES

1,544-1,545 MHz (space-to-earth)

1,626.5-1,646.5 MHz (earth-to-space)

 

 

 

1,645.6-1,645.8 MHz (earth-to-space)

 

 

 

 

VHF DSC (channel 70)

1,56.525 MHz1

 

MF/HF DSC2

2,187.5 kHz3 4,207.5 kHz

6,312 kHz 8,414.5 kHz

12,577 kHz 16,804.5 kHz

VHF AM

VHF FM (channel 16)

121.5 MHz

156.8 MHz

 

On-scene

communications

VHF channel 16 VHF channel 06

156.8 MHz 156.3 MHz

 

VHF AM

123.1 MHz

 

MF radiotelephony

2,182 kHz

 

MF NBDP

2,174.5 kHz

Communications involving aircraft

On-scene, including SAR radiotelephony

156.8 MHz 4 121.5 MHz5 123.1 MHz 156.3 MHz 2,182 kHz 3,023 kHz 4,125 kHz 5,680 kHz6

Homing signals

406 MHz distress beacons

121.5 MHz and the 406 MHz signal

 

9 GHz radar transponders (SART)

9,200-9,500 MHz

Maritime safety information (MSI)

NAVTEX Warnings NBDP

 

 

 

 

 

 

 

 

 

 

 

518 kHz7

490 kHz 4,209.5 kHz8 4,210 kHz 6,314 kHz

8,416.5kHz 12,579 kHz

16,806.5kHz 19,680.5 kHz 22,376 kHz 26,100.5 kHz

 

kHz 26,100.5 kHz

 

Satellite SafetyNET

1,530-1,545 MHz (space-to-earth)

Safety of navigation

VHF channel 13

156.650 MHz

Distress and safety traffic

Satellite

 

Radiotelephony

 

 

NBDP

1,530-1,544 MHz (space-to-earth) and 1,626.5-1,646.5 MHz (earth-to-space)

2,182 kHz 4,125 kHz 6,215 kHz 8,291 kHz 12,290 kHz 16,420 kHz 156.8 MHz

2,174.5 kHz 4,177.5 kHz 6,268 kHz 8,376.5 kHz 12,520 kHz 16,695 kHz

Survival craft

VHF radiotelephony

 

9 GHz radar transponders (SART)

AIS-SART

156.8 MHz and one other frequency in the 156-174 MHz band

 

9,200-9,500 MHz 161.975 MHz/162.025 MHz

 

 

  1. Frequency 156.525 MHz is used for ship-to-ship alerting and, if within sea area A1, for

ship-to-shore alerting.

  1. For ships equipped with MF/HF DSC equipment, there is a watch requirement on 2,187.5 kHz, 8,414.5 kHz, and one other frequency.

  2. Frequency 2,187.5 kHz is used for ship-to-ship alerting and, if within sea area A2, for ship-to-shore alerting.

  3. Frequencies 156.3 and 156.8 MHz may also be used by aircraft for safety purposes only.

  4. Frequency 121.5 MHz may be used by ships for distress and urgency purposes.

  5. The priority of use for ship-aircraft communication is 4,125 kHz. Additionally, frequencies 123.1 MHz, 3,023 kHz, and 5,680 kHz may be used for intercommunication between mobile stations and these stations and participating land stations engaged in coordinated search and rescue operations.

  6. The international NAVTEX frequency 518 kHz is the primary frequency for the transmission by coast stations of maritime safety information by NBDP. The other frequencies are used only to augment the coverage or information provided on 518 kHz.

  7. Frequency 4,209.5 kHz is not used by all States.

 

 

 

 

 

 

Frequencies for use in the GMDSS

 

DSC distress and safety calling

Radiotelephony distress and safety traffic

NBDP distress and safety traffic

2,187.5 kHz

2,182.0 kHz

2,174.5 kHz

4,027.5 kHz

4,125.0 kHz

4,177.5 kHz

6,312.0 kHz

6,215.0 kHz

6,268.0 kHz

8,414.5 kHz

8,291.0 kHz

8,376.5 kHz

12,577.0 kHz

12,290.0 kHz

12,520.0 kHz

16,804.5 kHz

16,420.0 kHz

16,695.0 kHz

156.525 MHz (VHF channel 70)

156.8 MHz (VHF channel 16)

 

MSI NBDP broadcasts by coast radio and earth stations

490.0 kHz

518.0 kHz

 

4,209.5 kHz*

4,210.0 kHz

 

6,314.0 kHz

8,516.5 kHz

 

12,579.0 kHz

16,806.5 kHz

 

19,680.5 kHz

22,376.0 kHz

26,100.5 kHz

On-scene search and rescue radiotelephony

2,182.0 kHz (R/T)

3,023.0 kHz (Aeronautical frequency)

4,125.0 kHz (R/T)

5,680.0 kHz (Aeronautical frequency)

123.1 MHz (Aeronautical frequency)

156.8 MHz (VHF channel 16)

156.5 MHz (VHF channel 10)

156.3 MHz (VHF channel 6)

Locating/homing signals

121.5 MHz (homing)

156-174 MHz (VHF maritime band - radiotelephony)

406.0-406.1 MHz (Cospas-Sarsat satellite locating)

9,200 to 9,500 MHz (X-band radar transponders - SART)

* NAVTEX service (coastal maritime safety information).

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