Having a quick look back through the Wiki edit history, I see that on 23rd Sept, the section highlighted in bold below was added.
..........Curtis-Taylor decided to have a 1942 Boeing Stearman restored.[9] As a result, the biplane was similar to Lady Heath's in size and design, but had some improvements such as a more powerful engine, additional fuel tanks,[14] and a ATC-transponder & GPS navigation system for use in controlled airspaces only (legal requirement).
First time I have seen a claim that her GPS was "for use in controlled airspaces only" !!!!!!!!