Ndrive G400: your portable policeman

"Every breath you take, every move you make..." once warbled The Police. How appropriate for any future ad campaign for the Ndrive G400, the first sat-nav with built-in breathalyser.By day it's a simple, budget navigator with 3.5in screen and countrywide maps. By night it turns into a veritable licence-saver because, should you find yourself wobbling to your car, you can simply blow on to a little sensor for a readout of your blood alcohol level.Of course, if you need to ask a sat-nav whether you're fit to drive, maybe you should be calling a taxi anyway.It's coming out in its native Portugal first, with roll-out (being the operative word) across the rest of Europe to follow. Essentials Ndrive G400 Price: €200 On sale: TBA Contact: Ndrive