https://maptools.com/
MapTools - Tools and information for using UTM, MGRS and latitude longitude coordinates
MapTools — coordinate plotting tools and clear guides to land navigation, coordinate systems, map reading, compass, and GPS.
tools and informationlatitude longitudemaptools
https://www.mail-archive.com/r-sig-geo@r-project.org/msg18885.html
Re: [R-sig-Geo] maptools, rgdal, rgeos and rgrass7 retiring Monday, October 16