Some models got a new navigation system in 2010 (model year 2011). This new system had a hard disk, to which all the maps were copied on install. You could then drive across the whole area covered (basically Europe + Turkey) and have maps available. The DVD (later USB memory) with the maps were not required when using the navigator in the car.
Before that, you had to change to another DVD, if you drove outside the coverage of the DVD currently in the car. Without any DVD in the car, you had no maps at all.
It's this system, requiring the DVD to be present, that you have.
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