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Hydrographic/Oceanographic, SVHOs

HMS Enterprise in calm waters
HMS Echo
Coming into Falmouth

HMS Echo and HMS Enterprise, two new multi-role Vessels Hydrographic/Oceanographic (SVHOs)) both built by Appledore Shipbuilders under the prime contractor Vosper Thorneycroft. With HMS Echo launched on 2 March 2002 and HMS Enterprise launched on 27 April 2002.

They have a range of 9300nm at 12 knots and an endurance of 35 days. Operationally available to the Commander in Chief Fleet for 330 days a year, a 50 per cent improvement over older existing vessels. Survey work can be carried out for 90 per cent of the year due to improvements in seakeeping. They are able to collect an array of military hydrographic and oceanographic data and due to their multi-role capability are able to support mine warfare and amphibious operations. Operating a 'lean' manned 3 watch system the total Ship's Company is 72, with 48 personnel onboard at any one time working a cycle of 75 days on, 30 days off; although to meet any contingencies, there is accommodation for 81 personnel.

A first for the Royal Navy, as they will be supported throughout the next 25 years by Vosper Thorneycroft under Contract Logistic Support (CLS), a MOD Smart Acquisition Initiative, where many of the stores, logistics and husbandry tasks will be co-ordinated and organised by the company. Extremely capable platforms, they are able to collect a wide range of military hydrographic and oceanographic data, both on and off the continental shelf, using a state of the art equipment suite. This includes:

Survey Vessels Hydrographic / Oceanographic, (SVHOs)
Displacement: 3500 tons
Length: 90.6 metres
Speed: 15 knots
Complement: 46 (Max 81)
Sensors: Multi beam echo sounder Single beam echo sounder Survey Planning and Processing Systems Side-scan sonar Oceanographic Probe and sensors Undulating Oceanographic Profiler Doppler Current Log Sub-bottom Profiler Bottom Sampling Equipment Survey Motor Boat fitted with multi beam sonar and sidescan sonar
Propulsion: Diesel electric propulsion system, 3 main generators (4.8 MW total) powering two 1,7 MW azimuth thrusters and 0.4 MW bow thruster.

The first RN ships to be fitted with azimuth thrusters which provide excellent efficiency and are able to turn through 360 degrees. When combined with the bow thruster through the Integrated Navigation System all three thrusters can be controlled by a joystick providing high manoeuvrability. Complete control and monitoring for power generation and propulsion, together with all auxiliary plant systems, tank gauging and damage control functions are provided through the Integrated Platform Management System (IPMS), accessible through workstations around the ship.

Both warships are designed and built to Lloyds rules to work in both hot and cold climates down to -20oC. Due to the unique operating pattern of the ships, accommodation is of an extremely high specification with all personnel sharing double cabins with ensuite facilities, except the Captain and Executive Officer who both have single cabins. Recreational spaces are also of a high specification.