There are several options depending on which R package you want to use. The following links should give you some insights into some of the possibilities available.
- Using maptoolsmapplots and specifically the
add.pie
function (see this worked example and map below) - Using the rworldmap package as described here
- Using the plotGoogleMaps package - see example here
(Map Sourced from: http://www.molecularecologist.com/2012/09/making-maps-with-r/)