 The "Annapolis" class received the same sensor and communications upgrades that others in the "St Laurent" family of ships received, including the installation of a new tactical data system (ADLIPS), updated radars and sonars, fire control and satellite navigation.They also received the new Canadian Tactical Towed Array Sensor or CANTASS which was a long-range towed sonar array that was affixed to the stern, which replaced the older VDS.The class also received a new lattice mast.