On the north-east edge of the Pennines, OS Explorer Map sheet 307 covers Consett, the Derwent Reservoir, & a number of smaller reservoirs. See if you can make your way to the top of Bolt's Law, at 540 m With this map you will receive a code for use on your i OS or Android smartphone or tablet. Find our more at Mobile Download FAQ. The OS Explorer map for Consett & Derwent Reservoir is available in both the standard paper version & weatherproof ' Active' version.