A number of satellite navigation devices have been identified as ‘best buys’ by consumer campaign group Which?, with the Snooper Syrius for UK and Ireland top of the list.
This device was given a 90 per cent rating and impressed on its accuracy and handling of a tricky city route.
Just behind is the TomTom mid-range Go 510, which received an 89 per cent rating. This system features software allowing drivers to select the quickest or shortest journey or a route that avoids toll roads.
In third place was the Garmin Nuvi, which was praised for its ease of use, while the TomTom One UK, the TomTom Go 910 and the Road Angel Nav 6000 were also named best buys.
Richard Headland, motoring editor of Which?, said: "Sat-navs often get a bad press for sending drivers the wrong way or down unsuitable roads, but our tests show that many of the newest portable sat-navs work very well.
"They’re also much cheaper to buy and easier to keep up to date than factory-fitted systems. If you want sat-nav in your car, make sure you go for one of our best buys."
Satellite navigation has enjoyed a boom in popularity in recent years, with sales increasing fivefold in the last two years, meaning that there are now more than four million systems in use on roads in the UK.