Auto Express have published their review of eight portable GPS navigators. 'If you already have a suitable mobile, a sat-nav application is a fraction of the price of a standalone unit, and there's just one bit of kit stuck to your screen. Security is not a problem either, as you always carry your phone. The only real downside is the sound and screen quality is only as good as your mobile. Some systems are server-based, where the map and routing are held remotely and supplied when requested.'
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