[R-sig-Geo] Plot one character on a spatial map

[Jim Burke]

I would like to plot a cex(17) darkgreen triangle at a specific lat/long
spatial map on an existing plot. Or a star at that location.

How might I approach this?

I saw an example (below) but so much like the internet not how to
implement. Besides this is probably for non spatial graphs
http://www.statmethods.net/advgraphs/parameters.html

Thanks in advance
Jim Burke

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