I connected my NMEA GPS to EM serial port 4 and configured the port. The "about" function in the admin menu is supposed to display present lat/lon, but all I get is 0.0000, 0.0000. I have performed the "loopback test" on serial #4 and can see all of the NMEA data flying by so I know the data is getting to the EM. I have not yet purchased the mapping software. Is the lat/lon disabled because of this? Seems unlikely. Why else would the position not update on the EM? (Note: the antenna has a clear sky view and the GPS is a known good data source).