Hot on TomTom's heels, rival Navman has got some new navigational tricks to show off with its S Series range. Not least is the ability to thwart thieves who pinch the device with the intention of hitting Home to find your address and burgling you - it has a four-digit security code. The top-end S90i is an ultra-slim 4.3in widescreen model. A dedicated SOS button brings up details of nearby hospitals, police stations and more. S Series satnavs can call the emergency numbers or navigate to them.