The lines are numbered along the edges of the map, and at ten grid-square intervals across the sheet. You can use these lines to pinpoint any location in Britain using a grid reference.

Storm-proofing as little as 1 per cent of the power lines in an electricity grid could slash the chance of hurricane-induced blackouts by between fivefold and 20-fold, a simulation suggests.

The grid maps for the state’s nine congressional and 30 legislative districts differ greatly from the state’s current map. They are also nothing like what the final new maps will outline ...