Bottlang Height reference: which geoid model?
My question is:
As we all know, in the Jeppesen Bottlang Airfield Manual, the airfield elevation (elevation of ARP) is stated. I assume that this is above MSL, or, technically speaking, above the "geoid".
However, "GPS height" refers to the WGS-84 reference system, with heights given as meters above the spheroid (or "ellipsoid"). To convert one elevation into another, I need to know the difference between the geoid height and the spheroid height. There are software programs available that allow me to do this.
However, for this I need to know the geoid model used by Jeppesen (there are hundreds of models that can be used).
So,
Which geoid model is used by Jeppesen for the calculation of MSL height?
Thankyou for your comments,
SF