Thanks for that CoolP.

The two VOR with DME (at least I believed they were DME) were definitely "off track". VOR CHK was "on track" so I chose VOR MKK (which is supposed to be DME), but it didn't update and my course was off by quite a few miles. I started the DME  POSITION  UPDATING once MKK was less than 100nm away.

I had read the information about the DME updating AND had the document open in Acrobat, so I thought I was doing it correctly. It is most likely that I stuffed it up somewhere, somehow. I just don't know what I got wrong. :-[

WAIT! I think I know what I might have done wrong. The "off track" VORs elevation! Maybe I entered the wrong elevation. I'll have to give it a try later and see. Thanks Paul it was this line that triggered this thought: I really don't want to over burden myself by looking up off-track VORs online to find out the elevation info and manually enter that data into the second INS unit.

Mark