Given a set of latitude and longitude coordinates pairs (stored in variables 
"latitudevals" and "longitudevals"), I would like to plot them onto the image 
of a equirectangular world map. I would like to plot each coordinate pair with 
a red circle, if possible. Does anyone have any suggestions as to how I go 
about doing this, whether using R or using another program like Google maps?
 
Thank you,
Steve
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