The Export OSM (OpenStreetMap.org) XML command allows the user to export any loaded vector data sets to an OSM XML format file that can be used to provide new data to the OpenStreetMap.org web site.
Import
When importing OSM.xml files that are larger than 1GB, if other data is loaded first, Global Mapper will display a dialog with the option to only import those features that intersect the current screen bounds. This is a method of cropping the data on import.
Export
When selected, the command displays the OSM XML Export Options dialog which allows the user to set up the export. The dialog consists of an Export Bounds panel which allows the user to set up the portion of the loaded vector data they wish to export.