Originally Posted by
IO540
There is a slight problem: if overlay approaches were authorised in the UK (which would be great but is highly unlikely) then many IFR approved GPS installations would not be able to use them. My KLN94 uses a version of the Jepp database on which many tracks are missing, and often only the final approach track is shown.
"Overlay Approach" in the sense the FAA uses it is different from the "approach representation" that you have in your KLN94. An overlay approach is a new approach that has the same track as the underlying approach (so is quick to define and needs no survey) but has all of the key points defined in the database (IAFs, stepdowns, etc) so you can fly it with the GPS providing your only guidance.