Honda Sat Nav DVD

[silverCTR]

I've recently bought a 2003 Accord with the Sat Nav option installed, it thinks the M6 toll is a field

I've had a quick search around the net and can't see anywhere offering update DVDs (the DVD in the car shows its made by "navtech"). Looking on the navtech website it doesn't list Honda as a manufacturer.

Do I have to go through Honda and does anyone have any idea of the cost?

Cheers