Why does coord_map produce a weird output?

Question

I\'m trying to draw a world map using ggplot. My code is in my gist file. The output is correct when I don\'t use coord_map but very strange when I use

Answer 1

Another solution is to use wrld_simpl from maptools instead, but it retains issues with Antarctica.

require(maptools)
require(ggmap)

md <- map_data("world2")
data(wrld_simpl)
ggplot(wrld_simpl, aes(group = group, x = long, y = lat)) +
  geom_map() +
  coord_map()