Help - Command ntg2.5 query

[oilpainting]

Ive had a command ntg 2.5 unit fitted to my 2006 w169 A class recently and am very pleased with the results apart from not being able to see sat nav directions in dash's instrument cluster screen

What needs to get done to enable this functionality and which Merc specialist in and around High Wycombe could do this?

Many thanks in advance

[audidoody]

These guys are fairly clued-up with after-market Comand

http://www.dkschweizer.co.uk/Mercedes%20Comand.htm