fakegps

A manual setting for GPS can be stored using a console/Telnet connection

fakegps 50.012345 -2.012345

The format is Digital Degrees (TBC) and they can be obtained from https://www.gps-coordinates.net/

To use Fake GPS, first determine your GPS coordinates in degrees only. Eg. N45.35165 W76.04777 Ditch the N,W,S,E prefixes, replacing W and S with a minus sign: 45.35165 -76.04777 Google Maps and smartphones are among the ways to determine those coordinates.

If an Internet connection is established then the time will be obtained.

https://www.cloudynights.com/topic/854327-homebrew-gen3-pcb-wifibtgpsmusbrelay/page-42#entry13139022