Originally Posted By: tfabris

It's not about whether or not they give you the answer in tenths of miles or not. It's about how much detail they measure in the crinkly bits.

While all that it true, it is perfectly possible to not store many crinkly bits on the device, but to still report distances of routes as if you had. The device doesn't just have to store the vectors that represent the road, it can also store the length of the road between two points, even if it has relatively little detail on the actual route the road takes.
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