IMHO there r more criterias can be added in e.g * O# @0 I& \: K. o- speed of navigation system & I1 I. \3 ~6 i" n9 `) x- ease of use , w. f$ E+ h2 ]6 q- l S4 z+ X# `- UI <-- quite important for a good user friendly interface- w( q: u K' V3 l: X$ I1 i9 D, U) g7 p
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