Sea Area A4

What Does Sea Area A4 mean in boating?

The Sea Area A4 is a maritime radio zone covering the polar regions north and south of the 76th latitude. These areas are beyond the range of satellite communication systems like INMARSAT.
Communication in the A4 Sea Area relies on High-Frequency (HF) radio supported by the Global Maritime Distress and Safety System (GMDSS). This system ensures the ability to connect with shore stations or other vessels and send emergency calls even in remote regions.

Practical tip:

Ensure your vessel is equipped with a fully operational HF radio and practice its use to communicate safely in polar regions. Regularly check weather updates and ice reports to minimize risks.