Map sheet number 184 in the OS Explorer series covers the east of Essex on the North Sea Coast. The Essex Way runs along the top section of the map from Harwich, passing near Colchester. Other highlights of the area include Clacton-on-Sea, Wivenhoe & Brightlingsea. 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 Colchester is available in both the standard paper version & weatherproof ' Active' version.