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Hi, In order to increase the accuracy of my Postzon postcode georeferencing file I am going to follow the method suggested by Gatrell et al (1991). i.e. adding 50 metres to each set of postcode coordinates MapInfo uses decimal degrees, and I'm not sure how to do this! Could anyone advise? One method would be to convert my decimal degrees to degrees, minuets and seconds. However I was wondering what the solution would be in decimal degrees. Thanks in advance Paul. ref: Gatrell, A. C., Dunn, C. E., Boyle, P. J. (1991) The Relative Utility of the Central Postcode Directory and Pinpoint Address Code in Applications of Geographical Information Systems Environment & Planning A 23 pp. 1447-1458 **************************************** Paul White Division of Integrated Health Care School of Health & Community Studies University of Derby Kingsway House Kingsway Derby DE22 3HL Tel: 01332 622222 Ext. 3171 Fax: 01332 622280 Email: [log in to unmask] be sure to reply now! **************************************** %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%