Originally Posted by
roundsounds
Melbourne is 400’ AMSL, FR24 data shows 650’ making it around 250’ AGL at the GA?
That would depend on whether the "650 feet" Mode S altitude from FR24 has or hasn't been corrected for QNH.
Given that it corresponded to at a point 1.6 nm from the THR, then I suspect they weren't actually at 250' AGL.