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Dear Bill and all=2C Yep you were right - for some strange reason (I'm not sure how...)=2C the l= atitude data were of class 'character' instead of 'numeric'. I've put that = right and that seems to have fixed it! Many thanks for your help=2C Steve =20 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.