The GPS Window displays real-time information on the current position and status of your aircraft and flight and retrieves this information directly from Flight Simulator.
A handsome tool, but…sometime you could get frustrated if you could not find this little screen.
First of all the GPS Window can optionally be made invisible by choosing the menu item GPS → GPS Window.
To make it visible again, choose this menu item again. When you did some manipulations with multiple screens, the configuration file saved other value than needed.
Dig into the configuration file of FSC90 and find the value of REMGPSWINPOS=???. Set this value to “0″ save the file and start again.
The GPS Window will show up in the upper right corner of monitor #1.