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The navigation system gets the speed pulse from the CANbus. It'll probably work reasonably well without it in most cases, though it will throw the occasional wobbler when you lose the GPS signal.
I'm not sure how the various components are wired together, but if they communicate via CANbus then this could be a more serious issue. As I understand it, CANbus isn't really a 'plug and play' type protocol. The network needs to be properly terminated at both ends, and this is normally handled by other devices in the car.
Before you go ahead with this, have you actually seen Carminat in action? The system is very dated, and all but the very cheapest personal navigation devices will wipe the floor with it. Carminat's only advantages over the likes of TomTom are that it doesn't spoil the look of the interior, it's difficult to steal, and it can usually maintain a track of your location if it temporarily loses the GPS signal (something which the likes of TomTom struggle to do, in spite of supposedly having clever technology to do it.) In every other respect, including speed, user interface and quality of mapping, a half-decent personal navigation device will wipe the floor with it.
Currently in Horatio's garage:
2010 Laguna III Initiale.