GNE buses are now appearing on the bustimes.org website live tracking map from what looks like today (12/02/19). This map displays service no. but by touching this the Fleet ID can be seen.
See:
https://bustimes.org/vehicles
A list of vehicles tracked so far is:
https://bustimes.org/operators/go-north-east/vehicles
The history of each bus tracked can be seen but only to when first tracked.
This website has increased the number of bus companies for which the buses are tracked significantly over the past few weeks and is continuing to increase the number.