Well done Lachlan ! No doubt he had a GPS (or possibly two as any sensible chap would have a spare as a precaution) but that does not seem to be a barrier for getting a navigation award at the very least.
The Russian balloonist and the crew of the solar powered aircraft also made some very notable circumnavigation flights.
All three should be candidates for crossing large amounts of blue on their maps in very credible circumstances. Everything was above board and nobody carried their bags to the luxury hotels while they searched for a hairdresser.