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Sagem modernises Seoul’s submarines

Issue No. 1 | January 01-15, 2012

The world specialist in inertial navigation, particularly for warships, Sagem (Safran) has been awarded the contract to modernise South Korean submarines. This latest success reinforces the company’s leadership in the field of precision inertia.

Under water, there is no point relying on GPS for guidance. Inertial navigation is therefore particularly important to submarines. To modernise the navigation system on board its Chang Bogoclass KSS-1 submarines and meet its precision requirements, the South Korean Navy has selected Sagem to supply its latest-generation system.

A submersible will be equipped with two Sigma 40XP inertial navigation units, and once the retrofit has been checked in operation, five more vessels in this class will in turn be upgraded.

“Seoul is already using around 50 of our laser gyro inertial reference units on surface vessels,” said Fabrice Delhaye, Director of Sagem’s Navigation Department. “With the contract we have just signed, we are now making headway into the submarine fleet where technical constraints are even greater.”

The Sigma 40XP (“eXtended Performance”) inertial system due to equip South Korean submarines is the high-end variant of the best-selling Sigma 40, designed for surface vessels, 600 of which have been sold across the world.

French (DCNS) and German (HDW) shipyards are making the system available on new vessels while a number of countries are opting for this equipment in their fleet modernisation programmes.

In a part of the world where submarine forces are growing fast, India and Vietnam have joined South Korea in making this choice. In France, the Sigma 40XP laser gyro inertial navigation system has been selected for the renovation of nuclear attack submarines while the version due to be fitted on the future Barracuda will offer even greater performance.