I created Mikrotik test installation in VMware Workstation (x86). I installed Mikrotik with GPS support as I wanted to test GPS. I cannot see a SYSTEM/GPS menu in WinBox. I can enter “/system gps” from console so I guess this is a WinBox bug (or missing feature). WinBox and MikroTik are 2.9.43.
winbox does not have all the same menus as terminal. for complete functionality - use terminal