What is maritime satellite connectivity?
Maritime satellite connectivity encompasses all satellite-based communication services used aboard commercial ships, fishing vessels, offshore platforms, yachts, and government vessels. It serves two fundamentally different functions: operational communications (vessel monitoring, navigational data, cargo management, regulatory reporting) and crew welfare (internet access for seafarers during voyages that can last months at sea).
Regulatory foundation: SOLAS and GMDSS
The International Convention for the Safety of Life at Sea (SOLAS) mandates that all vessels over 300 gross tonnes on international voyages carry equipment compliant with the Global Maritime Distress Safety System (GMDSS). GMDSS requires vessels to maintain distress alerting capability (EPIRB, INMARSAT C), maritime safety information reception (NAVTEX, EGC), and ship-to-shore/ship-to-ship communications. Critically, commercial VSAT and Starlink systems are not themselves GMDSS-certified — they complement but do not replace GMDSS-mandated equipment.
Technology landscape
Traditional maritime VSAT (GEO Ku-band and Ka-band) from providers including Inmarsat Fleet Broadband, Viasat, KVH, Marlink, and Speedcast delivers 2–50 Mbps per vessel. Starlink Maritime (launched 2022) disrupted the market by offering 200–350 Mbps at approximately $5,000/month for the Priority tier — 10× the bandwidth of comparable GEO services. By 2024, Starlink had equipped tens of thousands of commercial vessels, competing directly with established VSAT integrators.
IoT and digitalisation
Beyond crew internet, maritime connectivity enables: real-time engine performance monitoring for fuel optimisation (vessel performance management), cargo condition monitoring (refrigerated container temperature, liquid cargo sensors), e-navigation compliance (electronic chart reporting), and AIS data reporting. The International Maritime Organization (IMO) e-navigation strategy is driving increasing data connectivity requirements for commercial shipping.