.20 map is from "Teleatlas" .30 and .40 are from "Navigation Technologies", probably they contain less data.
Should have both on sd and use the one that better fits your needs, I think it depends on regions you navigate.
telatlas used by google maps, navteq used by ovi maps
i think google maps better than ovi maps. so that mean too CNI 2010.20 better than CNI 2010.40 :D
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