MarineCraft Journal 
The Automatic Identification System transmits real-time vessel data across VHF frequencies to ships, coastal stations, and satellites, improving situational awareness in congested waterways and supporting search and rescue operations globally. This guide covers how AIS works, what Class A and Class B systems do differently, what data is broadcast, and where the technology’s limitations lie.
The prow is more than the forward tip of a vessel. It’s a load-bearing structural element, a hydrodynamic determinant, and the feature that most visibly expresses a ship’s form and purpose. Understanding it is foundational to understanding how ships are designed and why they perform as they do.
The margin line is a subtle but powerful concept, an imaginary safety threshold drawn below the main deck that ensures vessels are assessed against stricter flooding criteria than the deck itself, providing a critical buffer between calculation and catastrophe.
A bulk carrier is measured in deadweight tonnes. A containership is measured in TEUs. A ro-ro vessel is measured in lane metres. The diversity of measurement systems in shipping reflects the diversity of what ships carry, and understanding each one is essential for anyone working across maritime operations, chartering, or cargo management.
Marine boilers have evolved from the primary drivers of steam-powered propulsion into sophisticated waste heat recovery systems central to fuel management, mechanical support, and crew comfort on modern vessels. This guide explains how they work, how heat transfers within them, how they are built, and what separates fire tube from water tube designs.
The ship’s generator is the powerhouse of every onboard system. When warning signs appear, the difference between prompt action and hesitation can mean the difference between a manageable repair and a catastrophic machinery failure. Here are the ten scenarios every marine engineer must recognise and act on without delay.
