Britain's navy has been operating across all regions of the globe over the past year. As international tensions rise and regional conflicts threaten to escalate, the senior service has seen its aircraft carriers sailing to the Far East, warships patrolling the Middle East, and in home waters the Royal Navy is keeping a close eye on Russian naval activity. As a special feature this year, we look at the development of British aircraft carrier technology and explain how it has revolutionised naval aviation. Royal Navy Yearbook 2025 profiles the ships of current fleet, the aircraft of the Fleet Air Arm and the units of the Royal Marines. Future threats and naval technology will also be assessed.