The key watchkeeping obligations are important for maritime safety and regulatory compliance. It encourages operators to stay up to date with FCC and IMO standards. Because VHF Channel 16 is the primary distress and calling frequency, it is required for continuous monitoring by compulsory radiotelephone stations, which emphasize its universal use across sea areas and vessel types.
All non-GMDSS vessels are mandated to maintain continuous watch on both 2182 kHz and Channel 16 when outside harbors or ports. The importance of the silent period in maritime distress communication is to allow weak, distant distress signals to be heard and to reduce interference.
Digital Selective Calling (DSC) Watchkeeping Bands
Mandatory bands/channels:
- 8 VHF HF DSC
- 1 other HF DSC
- 2 MHz MF DSC
- VHF Ch-70