NDrive 10 for phones - Manual (Page 64)

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Downloading items
Important: Be sure that you are downloading maps when you are connected to
WiFi
Country maps available in the NDrive Store can contain a large amount of data, which may have
a long downloading time and high data transfer consumption. Because of this, it is recommended
you start downloading large files from the store over your WiFi connection instead of 3G or
similar, to avoid additional cost from your phone operator.