The speed of your device determines the speed of the SD card you should use. Satellite navigation systems, like the Global Positioning System used in the United States, require that maps be stored in memory. You can augment the internal memory of your unit with an SD memory card, if the unit can support it. The speed of the card determines how quickly information can be written to and read from it.
What speed SD Card do you need in a Sat NAV?
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