The Type dimension of Maritime Fuel Cell Systems segmentation distinguishes the underlying electrochemical technology, primarily polymer‑electrolyte‑membrane (PEM), solid‑oxide fuel cell (SOFC), and alkaline fuel cell (AFC). PEM systems dominate due to their rapid start‑up, low operating temperature, and compatibility with existing marine diesel‑electric architectures, accounting for roughly 55 % of total installed capacity. SOFCs, characterized by high efficiency at elevated temperatures (600‑800 °C), are gaining traction in long‑haul vessels where fuel flexibility and superior thermal efficiency offset the longer start‑up time, contributing about 30 % of the market. AFCs, though less common, serve niche applications such as small‑craft auxiliary power where simplicity and low‑cost catalysts are valued, representing the remaining 15 %. Each technology’s share reflects its alignment with vessel size, operational profile, and regulatory pressure to reduce emissions, collectively shaping the overall market size of Maritime Fuel Cell Systems.