Flicked across to the pseudo ILS whilst on the 28 ILS into Blackpool yesterday, and it was giving me half-scale "fly down" deflection whilst established correctly on the real glideslope. Badness!

I have just downloaded an APP called Aviation tools for Android. Part of the package is ICAO charts, which show THR elevation and GUND defined as height above WGS84 datum.

Taking LHR 27R these are 78 and GUND 151. Maybe this could account for the discrepancy?

Does SD only offer pseudo ils to airfields that actually have ils approaches or does it work with all?

I dragged the hsi on screen today but at Amazon all airfields it did nothing on android.

Liam

https://www.instagram.com/liam548/

Is there a means then to recallibrate the GPS reported altitude within SD so that it exactly matches the pressure-set altimeter?

In my personal opinion you are trying to coerce SD into something it really doesn't want to be. SD is a VFR flight planning and navigation tool. It is NOT suited for IFR operations and should NEVER be used as an ILS substitute. I know that it is a real temptation to stuff all those gadgets into SD but it simply cannot do the job because it relies on GPS for position and altitude information, its elevation model is too coarse (1 km resolution, I believe) and does not have any radio receiver (ILS, VFR, NDB or otherwise). If you find yourself in IMC with a suddenly disfunctional ILS receiver, you should explore other options to reach terra firma: switch over to a different approach (minima permitting), ask for PAR guidance (if available) or divert to a different airport. Following SD's "ILS" to the ground is dangerous and can get you into serious trouble. Just don't let yourself be fooled by the looks.

Sorry, but I just wanted to get this out for once.

-- Chris.