Map sheet number 332 in the OS Explorer series covers the Northumbrian coast from Embleton Bay to Amble & inland as far as the source of the River Aln. Places to visit include: Craster, Alnwick Castle, Warkworth Castle, Dunstanburgh Castle, Long Crag & Rothbury. 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 Alnwick & Amble is available in both the standard paper version & weatherproof ' Active' version.