:PROCEDURE: overlay_map_obs :DESCRIPTION: Plot observatories on the world map. :PARAMS: obs: structure for observatories obtained by iug_get_obsinfo. :KEYWORDS: obs: structure for observatories obtained by iug_get_obsinfo. position: Set the location of the plot frame in the plot window charsize: font size of observatory name charcolor: color of observatory name psym: plot symbol for observatories symsize: symbol size symcolor: symbol color noname: If set, no observatory name will be written on the map. :AUTHOR: Y.-M. Tanaka (E-mail: ytanaka@nipr.ac.jp)