Finding The Right Satnav Dvd Disc

[the5rs]

I have just purchased a 2002 Corolla Verso T-Spirit with the full colour screen factory fitted Sat Nav (I think it is a TNS 500) with the DVD drive unit situated under the front passenger seat.

The current disc is dated 2001 and I am looking to update it. As my Toyota garage has quoted me nearly £250 for the latest disc, I'm looking for a secondhand one. I have noticed that the disc contains 4.98Gb of data which I assume is possible to fit on a standard commercial DVD. However, some of the newer discs seem to contain over 7.6Gb which must be using Dual Layer technology.

As my unit would be based on 2001 technology, I doubt that it would support Dual Layer. Does anybody therefore know what replacement disc I should be looking for to use in this unit.

Doug Richmond