Hello, having problems using the Environment - Location Tab, World Origin Coordinates, me too. (applies to TANE and TRS19, probably TMR17 also, have yet to test it)
If you are trying to change just the elevation, be advised. As of this writing, the dialog box in Surveyor is broken. Currently the only way to set the Altitude, aka Elevation, is by editing the config.txt of the route.
To set the altitude of your Route, you will need to set the 'world-origin' script