It should work, I think.
I have had my nav unit disconnected while using the screen for stereo things, whilst installing the stereo.
The screen works fine for radio, CD, and the on-board computer. However, the typeface/screen layout is very different and looks nowhere near as lovely as the cool blue that you get with Nav installed.
Hope this helps mate.
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2001 M5, Lemans Blue / Silverstone
Standard except for a few bits & stereo:
6.5" Focal components, 10" Directed sub, IceLink, JL Audio & Directed amps (hidden). Predator ICE, Stealth bulbs, V1, Roadpilot
1990 Mazda MX-5 (brilliant) 1998 Nissan Primera GT (modded)
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