----------------------------Original message---------------------------- Darius There is a converter in MapInfo. From there you might get it into ArcInfo. Barbara >Is there anybody out there who can supply reliable conversion >formulae - or the relevant constants and parameters - for >converting map data (Arc/Info coverages and ArcView shape files), >in both directions, between Irish Grid coordinates and UTM; and >also between Irish Grid and geographic (latitude and longitude) >referencing? Barbara Morris Geographical Data Support Data Library, Main Library Building University of Edinburgh, George Square, Edinburgh EH8 9LJ Tel.: 0131 651 1239; fax: 0131 650 3308 URL http://datalib.ed.ac.uk/