Serco publishes Guidelines for GPS In-Car Navigation Systems

Serco Usability Services has carried out independent research to investigate usability issues in the design of in-car GPS navigation systems. The result is a set of guidelines, 'Usability guidelines for GPS in-car navigation systems' now available on the company's website (linked below).

Director Owen Daly-Jones says: 'In-car GPS systems present both benefits and risks to drivers and pedestrians. It is particularly important that user interaction with a GPS interface is as simple as possible. These guidelines will help designers of these systems ensure the safety of their customers and other road users.'

These guidelines were derived from a series of expert reviews using one of the leading devices on the market. The research involved car journeys throughout the country and also in Central London.

Guidance includes the following:
• Take inspiration from mobile phone interfaces. Menu items should be indicated by icons large enough to be identified and selected at a glance, along with a word or two for identification.
• Controls should be tailored for use whilst driving. Complete touch screen operation is ideal for reducing attention taken from the road. However, touch screens must support finger control, as stylus control is not appropriate whilst driving.
• Any buttons should provide good tactile or audible feedback so the user does not have to look at the screen to see that the action has been carried out.
• The user should be able to take a diversion without having to manually update information. The device should adapt to the new route and should not resort to instructing the user to turn around.

Associated Link: See website for further papers and guidelines

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