Apart from seconding what xrayalpha has said, I am a bit sceptical about this initiative, especially since there does not seem to have been a lot of consultation.
If, as suggested by the information poster, "Good Intention and Position Reports may be (made) every few minutes" Safetycom could get overloaded on a good flying day.
And despite suggestions to the contrary in an earlier thread, the poster states that it "may/should be used alongside it (a Basic Service from Scottish Information) if appropriate and the aircraft has 2 x VHF transceivers"
I agree that this initiative could bring safety benefits in the Highlands, particularly if combined with
1) Fitting of TCAS to all military fast jets
2) Encouragement of the fitting of FLARM (and allowing uncertified ADS-B out) in more light aircraft and gliders
3) Improvements in the operation of the CANP
However, I think it would be much better to use a separate dedicated frequency. Anyway, we shall see- it is only a trial!