Turns out I was wrong. The UK government have utterly thrown us into the dark ages. There is now quite literally no basis for using SBAS for aviation in the UK.
The SoL service as it turns out (do you ever feel like you shouldn't have turned over that stone?) is the whole basis of SBAS usage for
any use of SBAS for safety critical aviation use. This means LNAV, the advisory glideslope of an LNAV+V, LNAV/VNAV etc.
So scrap everything I wrote above. Without being able to legally use SoL (which we cannot), you cannot rely on the information at all. This means:
- You must check RAIM prior to any approach.
- You cannot use the +V advisory glideslope
- You cannot fly an LNAV/VNAV unless you have Baro Nav.
The CAA need to actually provide better guidance- they need to highlight these key points about the +V and the VNAV (we have just started using it in anger to log 3D approaches for recency - guess that's in the bin).
The awkward truth is in these two documents. First the service definition of the SoL service from EGNOS:
https://egnos-user-support.essp-sas....fe-service-sdd
You can clearly see it mentions NPA, APV and LPV200 as capabilities. And here's the open service...
https://egnos-user-support.essp-sas....en-service-sdd
No mention of any aviation application whatsoever. Indeed it states:
EGNOS OS can only be used for non-safety critical purposes, i.e. purposes that have no impact on the safety of human life and where a failure in availability, integrity, continuity or accuracy of the EGNOS SIS could not cause any kind of direct or indirect personal damage, including bodily injuries or death.
Next time anyone thinks about answering a question on pprune, be careful what you wish for.