It's interesting that this old thread should re-surface now.
I'm just getting to grips with my newly installed glass cockpit that uses Jepp data and I too am slightly underwhelmed by the data presented.
In this picture you can see a yellow circle with "SFC 28". It's at the location of WCO but doesn't present itself as any kind of navaid, even as a GPS waypoint.
Having consulted the paper chart is see that it too contains a similar but not identical label (GVS/2.8) which I confess do not assist in my comprehension of what it is that is being represented.
https://picasaweb.google.com/1108573...eat=directlink
Sorry but couldn't get the image to show directly....