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I don't think it's the disc because before a few weeks ago everything was working fine. The GPS unit seems to be a bit unresponsive in terms of aiming the red direction arrow in my true heading (even though the compass readout on the dashboard works perfectly) so that's what I think the root...

Recently the navigation unit in my 2010 Tahoe started having issues. Specifically, 1) it no longer displays the street name I'm currently driving on at the bottom of the screen and 2) the red arrow that shows my heading takes anywhere from a few seconds to >1 hour to point in the right...