I don't know if you can set it in "Settings" (I have Mk3) but NavCoder can code to mono or colour for you - only a €20. You can download and explore the shareware version here to check out all it's possibilites before buying.

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer