Northrop Grumman to provide navigation suite upgrades to Royal New Zealand Navy Northrop Grumman has been selected by the New Zealand Ministry of Defence to provide navigation suite upgrades to the two Royal New Zealand Navy's ANZAC Class Frigates. The navigation suites will replace existing MK49 inertial navigation units with fourth-generation MK39s. These new inertial navigational units are next-generation and feature an embedded data distribution system. In addition to a significant reduction in weight and size, the newer MK39 has autoselect features that ensure the highest quality data is made available to the ship. The unit also enables a lower cost of ownership.