Your GPS antenna is in the dash. Did you have anything sitting on the dash?
If they removed the NAV unit to setup the FM connection, they may have forgotten to plug in the green GPS antenna when reinstalling.
There is a known problem with the Roady XM receivers interfering with portable GPS units. I haven't read about any problem with the commander. Try running with the XM off to see if it makes a difference.
Where did they install the XM antenna?
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