Leonard J. Cowley is similar in design to CCGS John P. Tully.
Leonard J. Cowley is 72 m (236 ft 3 in) long overall with a beam of 14.2 m (46 ft 7 in) and a draught of 4.5 m (14 ft 9 in).
The ship has a full load displacement of 2,080 long tons (2,110 t) with a 2,188 gross tonnage (GT) and a 655 net tonnage (NT).
The ship is propelled by one controllable-pitch propeller driven by two Polar Nohab F312V geared diesel engines creating 3,160 kW (4,240 hp).
This gives the ship a maximum speed of 15 knots (28 km/h).
The ship also carries one Caterpillar 3306 emergency generator.
The vessel carries 420.00 m³ (92,390 imp gal) of diesel fuel giving the ship a range of 10,000 nmi (19,000 km) at 12 knots (22 km/h) and allowing Leonard J. Cowley to stay at sea for up to 35 days.

The vessel is ice-strengthened, being certified as Type B. Leonard J. Cowley has a flight deck capable of operating a light helicopter of the MBB Bo 105 or Bell 206L types and a retractable hangar.
There is a helicopter strobe beacon and VHF homing transmitter for navigation, and an agent-and-foam system for fire fighting on the helicopter deck.
The ship is equipped with an autopilot including adaptive steering gear, a shilling rudder and a 250-horsepower (190 kW) bow thruster for maneuvering.
Leonard J. Cowley has a computer system which identifies exact locations of other vessels, and two radars, one of which has a feed to the electronic charting unit.
The vessel also has a Differential Global Positioning System (DGPS) feed and a Global Marine Distress Safety System.

The fisheries patrol vessel has a complement of 19, with 9 officers and 11 crew and 20 additional berths.
Leonard J. Cowley monitors fishing activities to fulfill Canada's commitment to the Northwest Atlantic Fisheries Organization.
Due to the nature of the vessel's duties in fisheries enforcement, Leonard J. Cowley often carries an armed boarding team.
While Leonard J. Cowley's primary task is fisheries patrol, the vessel also carries out search and rescue operations.
Leonard J. Cowley is similar in design to CCGS John P. Tully. Leonard J. Cowley is 72 m (236 ft 3 in) long overall with a beam of 14.2 m (46 ft 7 in) and a draught of 4.5 m (14 ft 9 in). The ship has a full load displacement of 2,080 long tons (2,110 t) with a 2,188 gross tonnage (GT) and a 655 net tonnage (NT). The ship is propelled by one controllable-pitch propeller driven by two Polar Nohab F312V geared diesel engines creating 3,160 kW (4,240 hp). This gives the ship a maximum speed of 15 knots (28 km/h). The ship also carries one Caterpillar 3306 emergency generator. The vessel carries 420.00 m³ (92,390 imp gal) of diesel fuel giving the ship a range of 10,000 nmi (19,000 km) at 12 knots (22 km/h) and allowing Leonard J. Cowley to stay at sea for up to 35 days.
The vessel is ice-strengthened, being certified as Type B. Leonard J. Cowley has a flight deck capable of operating a light helicopter of the MBB Bo 105 or Bell 206L types and a retractable hangar. There is a helicopter strobe beacon and VHF homing transmitter for navigation, and an agent-and-foam system for fire fighting on the helicopter deck. The ship is equipped with an autopilot including adaptive steering gear, a shilling rudder and a 250-horsepower (190 kW) bow thruster for maneuvering. Leonard J. Cowley has a computer system which identifies exact locations of other vessels, and two radars, one of which has a feed to the electronic charting unit. The vessel also has a Differential Global Positioning System (DGPS) feed and a Global Marine Distress Safety System.
The fisheries patrol vessel has a complement of 19, with 9 officers and 11 crew and 20 additional berths. Leonard J. Cowley monitors fishing activities to fulfill Canada's commitment to the Northwest Atlantic Fisheries Organization. Due to the nature of the vessel's duties in fisheries enforcement, Leonard J. Cowley often carries an armed boarding team. While Leonard J. Cowley's primary task is fisheries patrol, the vessel also carries out search and rescue operations.
CCGS Leonard J. Cowley