The International Maritime Organization (IMO) has issued the Interim Guidelines for the Safety of Ships Using Ammonia as Fuel, known as MSC.1/Circ.1687, to support the use of ammonia as a marine fuel in achieving decarbonisation goals. These guidelines, although non-mandatory, offer a structured approach covering various aspects such as ship design, equipment, operations, bunkering, toxicity mitigation, and crew safety. They align closely with existing codes and principles to provide a consistent reference for industry stakeholders. In addition to the guidelines, regulatory developments include amendments to SOLAS Chapter II-1 to explicitly include gaseous fuels like ammonia and updates to the IGC Code to permit ammonia-fueled operations on ammonia carriers. Furthermore, new training guidelines for seafarers focusing on ships using alternative fuels have been finalized, with both basic and advanced training requirements and emergency drill mandates. The IMO is also working on developing fuel-specific training programs, with ammonia being among the first priorities for future guidelines.