The maritime industry relies heavily on a vessel’s ability to communicate at sea. Whether it’s to report position, conduct maritime operations, arrange for shore services, or raise distress alerts, mariners need bespoke and reliable communications solutions.

With over 70% of the planet covered by oceans and no mobile networks at sea, seafarers have only one reliable option if they want to communicate during voyages: satellite networks 

Connected vessels primarily utilize high-speed access provided by Ku and Ka-band satellite solutions such as Very Small Aperture Terminal (VSAT) or Starlink for both business operations and crew welfare. However, a more resilient and reliable link is needed for critical operations, safety and security.

L-band is the de-facto maritime standard for satellite communications, and the logical and dependable companion to Ku and Ka-band systems. Iridium is the critical companion link enabling reliable connectivity globally for the maritime industry.

Ka- and Ku Band vs. L-Band Satellite Connectivity

Ku and Ka- are higher frequency bands that offer wide bandwidth and faster transfers, allowing more data-demanding applications both for ship’s business and crew welfare. However, Ku and Ka- are more susceptible to loss of service due to inclement weather and line-of-sight blockages – particularly for service from geostationary (GEO) satellites, smaller service areas and restrictions on usage in and around certain major ports.

L-band is a low-frequency satellite signal that provides reliable, always-on connectivity, even in remote or harsh conditions. It’s ability to work through inclement weather, and in gaps where Ka and Ku- band don’t reach make it an essential component in hybrid maritime communications. Although L-band cannot match the broadband speeds of Ka and Ku-band systems, its dependability and reliability are vastly superior.

A Smarter Hybrid Maritime Network

In today’s connected maritime environment, most vessels use hybrid networks—combining VSAT or Starlink with Iridium to ensure always-on connectivity.

Iridium GMDSS provides the most complete solution for modern maritime. The terminals feature distress alert, safety voice and Maritime Safety Information (MSI), while integrating additional regulated services like Long Range Identification and Tracking (LRIT) and Ship Security Alert System (SSAS).

The combination of capabilities offered by Iridium GMDSS terminals sets a new standard for the cost, efficiency, and performance of maritime safety and security solutions, making it the critical connectivity service needed for any ship's hybrid network system.

L-Band's Role in Maritime Safety and Security

L-band remains the primary network for maritime safety and security services, including distress alerting or notifying authorities of a pirate attack. The International Maritime Organization (IMO) mandates that all Safety of Life at Sea (SOLAS)-class vessels have L-band-based regulatory equipment and services onboard. 

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