What Car? guide to portable sat-nav - Road Angel Navigator

Cost £250
For Plenty of features, lots of useful information
Against Entering address details is fiddly. No predictive function
Verdict Not the best but you still get a lot for your money

As well as navigation, this unit warns you as you approach an accident blackspot, fixed safety camera, primary school or the congestion zone. Road Angel recommends you update the system from the database every couple of weeks, depending on your mileage, and the price includes six months' subscription.

Entering address details can be a fiddly business with the Road Angel, and there's no predictive function to help cut time when typing destinations. Nevertheless, there's plenty of useful information shown on screen, plus a Points of Interest function.