The LN-251M is the first M-code navigation system for naval aircraft, providing an additional layer of protection against GPS disruptions. M-code technology enhances positioning, navigation, and timing (PNT) capabilities, allowing pilots to operate effectively even when GPS signals are degraded or denied.
Aircraft currently equipped with LN-251 systems that feature Selective Availability Anti-Spoofing Modules (SAASM) GPS can be upgraded to the M-code configuration, enabling a smooth transition. The LN-251M is designed to integrate with existing navigation systems and is compatible with future software and GPS modernisation efforts.
Ryan Arrington, Vice President of Navigation and Cockpit Systems at Northrop Grumman, described the LN-251M as an advancement in airborne navigation that enhances operational resilience. He stated that the upgrade provides pilots with a jam-resistant navigation system, supporting operations in environments where traditional GPS signals may be unreliable.
Northrop Grumman has been producing the LN-251 INS/GPS since 2003, with nearly 5,000 units delivered, including the similar LN-270 variant. The LN-251M upgrade builds on this legacy, offering improved navigation capabilities to support evolving operational requirements.
Source: Northrop Grumman (press release).