Navman S150 Platinum

Design, large display, “gliding” touch screen interface, keyword search method, text-to-speech pronunciation, clear map screen, Bluetooth

Touch-sensitive menu key isn’t always responsive, glide interface can be annoying while driving, traffic channel antenna is an optional extra

Although the S150 doesn't have all of the features of its more expensive sibling, Bluetooth hands-free remains, as does the excellent navigational experience.