Although you might understand the basic functionality, you may still be curious to know what makes your TomTom GPS device tick. Whether you own a TomTom 940 or XL, each device consists of two major components: hardware and software. There is small computer in your sat nav receiver that makes sure the software runs efficiently. Depending on your TomTom model (if you don’t have one yet, choose your sat nav here), the software is either located on the hard disk or an SD card. With most devices, the hard disk itself has a capacity of at least 20 GB.
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