The GSAK polygon/line mapping tool is an online tool that will enable you to create polygons and lines compatible with the GSAK arc filter (Search=>Filter=>Arc/Poly) and polygons for the GetPolygon() macro function.
This tool is web based, using a Google API, and therefore will only work when connected to the Internet.
When you click on OK this option will open your default browser at the online link to this tool. In effect, this option is really just a "bookmark" to this web address but is provided here for easy and ready access.
This option is also on the "Search=>Filter=>Arc/Poly" dialog.