The file linked below contains a current map of the NASA GGN network stations. The status of each station is based on the most recent monitoring data available.
http://www.unavco.org/instrumentation/networks/nasa-ggn/soh-map/index.php
Article ID: 41
Created: October 22, 2008
Last Updated: October 22, 2008
Author: Freddy Blume
Online URL: https://kb.unavco.org/article/nasa-ggn-current-station-status-map-updated-regularly-41.html