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#1
February 28th 04, 01:28 PM
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"Steven P. McNicoll" wrote: wrote in message ... He did not say that right. There is VOR/DME-RNAV as well as INS RNAV, IRS RNAV, GPS RNAV, and LORAN RNAV. IRS RNAV? Not in the airplanes you fly, Steve. In the big ships, three IRUs that provide the attitude platform and the basic inertial reference. If the GPS failes, the DME/DME fails, the VOR/DME fails, and the VOR/VOR fails then a slightly degraded, but noneless very good position is provided by the IRUs via the FMS, which in combination is known as the IRS (inertial reference system), which in turn is IRS RNAV when all external sensors are not available. 
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