The Trafalgar Class all belong to the 2nd Submarine Squadron based at Devonport. Since build, each boat has received a combat data system update at refit with Type 2076 sonar integrated with the SMCS (Submarine Command System) and countermeasures. The Class has progressively received a Spearfish heavyweight torpedo fit and a 1000 mile range Tomahawk land-attack cruise missile (TLAM) capability is being retrofit to each boat during refit from 1998, starting with HMS Triumph and HMS Trafalgar.
