Brat Nav... the GPS that can tag your teenager (or errant husband) absolutely anywhere in BritainBy POLLY DUNBAR - More by this author » Last updated at 20:38pm on 14th July 2007 It could be the perfect answer for parents anxious about their children's whereabouts. A device the size of a large matchbox is being launched that exactly pinpoints a carrier's location through a global positioning system accessed by computer or mobile phone. The gadget, called buddi, can be clipped to children's clothing or carried in their pockets. Parents then log on to see their child's position on a...