Raytheon Co. selected Northrop Grumman Corp. to supply the inertial measurement solution for the Joint Precision Approach and Landing Systems (JPALS) Shipboard Reference program. Northrop Grumman's Navigation Systems Division will deliver 18 LN-270 inertial navigation systems (INS) for the engineering and manufacturing development phase of the JPALS Increment 1A Shipboard Reference System (SRS). The first LN-270 unit will be delivered in early 2011. JPALS works with GPS to provide accurate, reliable, landing guidance for fixed and rotary wing aircraft and supports fixed-base, tactical, and shipboard applications. For the SRS, each JPALS-equipped ship will employ three Northrop Grumman fiber-optic gyro-based LN-270 INS units to measure the ship's motion.