MIT ICAT Inertial Reference Unit Integrate acceleration from known position and velocity ∨e|ocit 口 Position Need Heading 口Gyos Mechanica Lasel · Can get Attitude Q Artificial Horizon(PFD. HUD) Drift Errors d IRU unusable in vertical direction(need baro alt) 日 Inflight Correction DME GPS Star Sighting for Space Vehicles Measurement Give Attitude also 777 Analytical RedundancyMIT ICAT Inertial Reference Unit y Integrate acceleration from known position and velocity † Velocity † Position y Need Heading † Gyros ‹ Mechanical ‹ Laser y Can get Attitude † Artificial Horizon (PFD. HUD) y Drift Errors † IRU unusable in vertical direction (need baro alt) † Inflight Correction ‹ DME ‹ GPS ‹ Star Sighting for Space Vehicles y Measurement Give Attitude Also y 777 Analytical Redundancy