Thank you Andrew, spelling that correctly helps me in a whole host of ways!
I have been bothered by this because I came across this page
http://216.109.132.28/cornesti_vinga.html
and it all seems like crap but the castra link sort of seemed like it looked plausible because I think I can see what they see and it might be worthy of the designation on the Tabula.
It is a strange world.