If you use the spatial objects provided by the sp-package (http://cran.r-project.org/web/packages/sp/vignettes/sp.pdf) you transform your data to other projections using the spTransform package.
Thus you will need the rgdal package in complement (it actually includes spTransform). This function is extremely convenient: you can manage coordinate transformations extremely easily for common systems (WGS84, UTM) within the R environment.
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