Given that the aircraft involved was operated by the USAF, I wonder if the crew could actually read the chart in the first place, even if it was correct.
Reports at the time suggested that the subject aircraft was well off course, and far too low for the sector involved.
And further, if the stations were not listed on the chart in the first place, wonder just why the approach was started, considering the difficulties involved in navigating successfully.
More than likely, hotshots at the pointy end not quite knowing what they were doing.