Can you re-use a navman map update CD/DVD?

callum.irvine, May 3, 7:39am
Someone is selling their maps for their navman. They say they have used it already. Wouldn't this mean I can't use it for mine!

m16d, Jan 7, 6:40pm
As far as I know they can only be used once.
Navman site says no refund on cd's that have been activated.
But I'm sure there's someone out there that can bust the code.