You can install a
microSD™ memory card for additional storage or pre-loaded maps.
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Turn the D-ring counter-clockwise, and pull up to remove the cover.
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Remove the batteries or battery pack.
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In the battery compartment, slide the card holder to the left and lift up.
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Place the memory card with the gold contacts facing down.
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Close the card holder.
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Slide the card holder to the right to lock it.
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Replace the batteries or battery pack.
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Replace the battery cover, and turn the D-ring clockwise.