Using its Smartnav system, the service allows users to only pay for sat-nav directions and traffic information when they need it, and is available using an Apple iPhone.

Trafficmaster says the introduction of a PAYG service is ideal for drivers who are not sure how often they are going to use it.

They download an initial five routes for only £1.79. Thereafter they are able to purchase 10, 20 or 30 top-up routes.

Smartnav PAYG is part of the Trafficmaster Companion suite of travel services available on the iPhone, which include automatic map updates, route calculations based on live traffic information and time of day data. It also provides ongoing route monitoring, which alerts drivers to new traffic problems en-route and the provision of alternative quicker routes.

Smartnav PAYG is supported by Trafficmaster’s team of Personal Assistants (PAs) who operate round the clock, 365 days a year. The PAs are on hand to help download routes and can be called upon in emergency situations, such as breakdowns and road accidents.

For more information about Smartnav PAYG and Trafficmaster’s other services go to www.trafficmaster.co.uk