To order a Discoverer Series map, use the diagram below to help identify a particular area/sheet number. After identifying a sheet number, click on either 'flat' or 'folded' to view more detail about the map. You can then add the product to your shopping cart. NOTE: Sheets 1,2,3,6,10,11,16 and 25 are published by Ordnance Survey of Ireland as part of their Discovery series.