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The LN-200 is a small, light weight, highly reliable, state-of-the art, fiber-optic, all-altitude, strap down Inertial Measurement Unit (IMU). The LN-200 has three solid-state fiber-optic gyros and three solid-state silicon Micro Electro-Mechanical System (MEMS) accelerometers in a compact package that measures velocity and angle changes in a coordinate system fixed relative to its case. Digital output data of incremental velocity and incremental angle are provided to user equipment over a digital serial data bus. The LN-200 is hermetically sealed and contains no moving parts, ensuring low noise, long usage and shelf life. The LN-200 has been in high rate production since 1994 with over 25,000 units produced.