hence.. the key question for you is.. what do you need it for and in what manner.
if you need it for alerting you during an activity using a native garmin app (say.. Trail Running) - then there's no way to do that via a datafield.
If you need it for a widget - Sure can be done but not exactly sure of the use case for something like this.
If you need it for running / trail running - the only way this could be available is if someone creates a FullBlown Running App and have this in the code. (to be honest, I have something in the works but it's still in the works.. LOL...)
If session not started. Display GPS Accuracy status. 4/4 is Max = 100%
Also provide Tone / Vibrate alert (1x only) when signal is 100%
If session is started. Alert user if GPS signal lost via Tone/Vibrate
When GPS comes back - just remove the status. No Alert / Vibrate
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the above seems to work OK, but I am not a good enough coder to make the watch alert/vibrate again once (key word is ONCE) the GPS gets re-acquired. Hence I opted to just alert when signal is lost.
Havent worked on that piece of code for some time tho..