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Question:

Why portable navigator must insert card

Why portable navigator must insert card

Answer:

Because the card has a map software, if there is no card can not run the map, so there will be no navigation significance.
Because the card has a map software, if there is no card can not run the map, so there will be no navigation significance.
Because the card has a map software, if there is no card can not run the map, so there will be no navigation significance.

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