Join Date: Jul 2005
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Short and sweet: No there isn't.
On a TomTom, you can add files via USB or by plugging the SD card into your PC. They've taken advantage of that by letting you add custom POI including speed cameras.
On Carminat, all of the data is on the CD. They certainly wouldn't want to encourage people to make copies of it, so there's no scope for changing the data.
I did take a look at the disc once. The data looks impossible to interpret, let alone modify, without a lot of additional information.
Currently in Horatio's garage:
2010 Laguna III Initiale.