IMHO there r more criterias can be added in e.g, D0 e* j8 P+ k) L1 M0 D: q+ N& n
- speed of navigation system4 \7 r( t7 q& W$ F
- ease of use: M# `! u$ l; X! C" Y. z6 k- X
- UI <-- quite important for a good user friendly interface 6 ~/ a: \7 n1 D 2 K1 G9 r* h" g+ C6 A! f4 ] : _7 L+ e8 P$ Q3 L:)