I just bought a new TomTom Rider 550 and I see there is a slot for a memory card, but the instruction book ignores that it is even there. Does anybody know what card I should put in there. Size, brand or anything?
Depends upon what you need to store. Usually it's used for maps in the event that the device won't hold all you need.
Since the 550 starts with 16GB of memory, you will probably never have a use for a uSD card. All of North America will fit very nicely in what you've got.
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