IDL Device Question
 

I'm using IDL to plot contour on a map, outputting a postscript file. Everything works fine but I need to determine the positions of the corners of the plot window in order to write down the latitudes and longitudes using xyouts (I want them in the form 80W, 20N, and so on, not as plain integers, which I don't think it will automatically do).

I tried using the /device tag in xyouts but I actually want the xyouts outside of the area specified for the map. Any help is appreciated.