in the answer we get. The more points from which we measure our distance, the smaller the likely error in our calculated position.Now imagine we can, from anywhere in the world, measure our distance from a number of different satellites in space. This is how GPS

zone at the back of the shoe from the rest of the sole unit. This design improves a shoe's shock-absorption capabilities by reducing the impact forces travelling from the heel to the rest of the outsole and midsole. The latest running shoes achieve

. Good for: relief from knots and niggles   Montane Featherlite Marathon Jacket, from £40 www.montane.co.uk Billed as the world’s lightest running jacket, the Featherlite Marathon Jacket is a 98 per cent breathable, wind

pace, then one mile cooldown at 14mm pace).Weaknesses: Bit chunky and the rubber strap doesn't allow for many fitting adjustments. Would perhaps be more comfortable with a fabric strap with a clasp so could be fitted at any size. If you have travelled a