[R] map with inset

[markw]

Hi, 

I am trying to put an inset of North America onto a finer-scale map and
cannot seem to get the two maps on the same plot.

the main map is:
map("worldHires", c("Canada", "USA"), xlim=c(-75, -52), ylim=c(40, 55),
col="gray90", fill=TRUE)
map.axes()
map('rivers', add=TRUE)
map.scale(-73, 54, relwidth=0.2, ratio=FALSE)
rect(-59.5, 46.5, -52,52)
text(-53,51.5,"A")
rect(-69, 43, -59.5,49.5)
text(-60, 49, "B") 

and in the bottom right corner I want the following map scaled so it doesn't
overlap with my main map:
map("worldHires", c("Canada", "USA"), xlim=c(-170, -50), ylim=c(24, 90),
proj="gilbert")

Any suggestions?

Mark



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