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Reference.org
Inertial reference unit
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Air_data_inertial_reference_unit/FdqGvycr">Air data inertial reference unit</a></li> <li><a href="/facts/Inertial_measurement_unit/IEsFdrtm">Inertial measurement unit</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20100520150741/http://www.aptec.com/ATAWeb/irus.htm">Optical Inertial Reference Units (IRUs)</a></li></ul>