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IF ULTIMAX REPORTS ERROR MESSAGE "INITIALING NAVIGATION SUBSYSTEM ERROR"  

This article applies to:
BMC Series
Machining Centers 
UltiMax

Answer:
The problem is that the saveprog.hd3 file on the D: Drive is corrupted. So, hook up an external keyboard and boot up a DOS 5.0 or higher bootable disk and delete the saveprog.hd3 file from the D: drive.  

 
 
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