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This may sound like a dumb question, but, I currently have an f7010bt and love it. I am thinking about buying an avic D3 for my 2nd vehicle. My question is this: Does the D3 read the map from memory after its loaded(Like the f7010), or does it simply read it from the disc inserted into the disc drive-in other words-if it has to read it from the disc then I cannot play a dvd or a cd at the same time. thanks in advance