Map sheet number 144 in the OS Landranger map series is the ideal map for planning days out & holidays to Norfolk. Walk part of the Peddars Way & Norfolk Coast Path. Towns included in the area of this map are Thetford, Diss, Wymondham, Breckl&, Attleborough & Watton. The map covers an area of 40 km by 40 km (25 miles by 25 miles). 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 Landranger map for Thetford & Diss is available in both the standard paper version & weatherproof " Active" version.