BAE Systems is bringing four configurations of its Bofors 40mm naval gun technology under one product family, giving ship operators different ways to tackle incoming aerial and surface threats. The lineup ranges from a gun with independent electro-optical targeting to a radar-equipped close-in weapon system designed to intercept missiles and drones.Called the Sea Tridon family, the lineup includes Sea Tridon, Sea TridonC, Sea Trinity and the Bofors 40 Mk4 Naval Gun. Each configuration serves a different operational requirement, but all four use the company’s programmable 3P ammunition.The announcement reflects a growing challenge for naval forces. Drones, missiles and other relatively inexpensive weapons are adding new demands to shipboard defenses. BAE Systems is positioning its new family as a way to give operators more choices without introducing entirely separate weapons and support systems.Expanding naval firepowerSea Tridon combines a Bofors 40mm gun with an integrated electro-optical fire-control system. Its independent targeting capability gives operators greater control over engagements and simplifies integration with different vessel designs.Sea TridonC takes that arrangement to sea inside a containerized package. Crews can install it aboard military, government or commercial vessels that need additional protection for particular missions. Its design also makes temporary deployment possible without requiring a permanent weapons installation.Sea Trinity brings radar into the equation. The system combines the Bofors 40mm gun with radar-based fire control and 3P ammunition. BAE Systems describes it as a complete close-in weapon system (CIWS), intended to engage incoming missiles, drones and other high-speed threats.The Bofors 40 Mk4 Naval Gun takes a different approach. Its compact, lightweight design allows integration with a vessel’s existing combat management systems. It can engage both aerial and surface targets without the more extensive configuration offered by Sea Trinity.Lena Gillström, president of BAE Systems Bofors, said the maritime threat environment is changing rapidly. She described the family as a flexible option for navies seeking different levels of defensive capability.Six ways to program a roundThe ammunition deserves attention in its own right. All four configurations use Bofors 3P programmable ammunition, which lets crews select the projectile’s fuze settings immediately before firing.The system offers six programmable fuze modes. These allow the same ammunition family to engage different target types, including aircraft, surface vessels, and threats along shorelines.That versatility changes how operators can approach an engagement. Instead of depending on separate ammunition types for different targets, crews can configure the projectile to suit the situation.The shared ammunition also gives the four configurations a common logistical foundation. BAE Systems says the wider family maintains commonality in training, logistics and support, despite differences in sensor integration and fire-control equipment.Gillström said operators could select the configuration that best matches their operational requirements while retaining access to established technology and programmable ammunition.BAE Systems will showcase Sea Tridon at Euronaval 2026 in Paris. The system will appear at stand E30, alongside the company’s wider naval defense offering.