Title: 
Headings: Aircraft Inertial Navigation System/Inertial Reference System
Aircraft Inertial Navigation System/Inertial Reference System
Content: The GPS is extremely accurate in itself. When combined with IRS, it creates one of the most accurate navigation systems available. The GPS is used to initialize the IRS so the pilot no longer needs to do so. GPS also feeds data into the IRS computer to be used for error correction. Occasional service interruptions and altitude inaccuracies of the GPS system pose no problem for IRS/GPS. The IRS functions continuously and is completely self contained within the IRS unit. Should the GPS falter, the IRS portion of the system continues without it. The latest electronic technology has reduced the size and weight of INS/IRS avionics units significantly. Figure 2 shows a modern micro-IRS unit that measures approximately 6-inches on each side. Figure 2.