NavList:

Drift Check for Landfall

Chichester may have independently evolved the deliberate offset or "Landfall" method of finding an island.  Taking his  6 hour flight from Norfolk to Lord Howe as an example, he deliberately aimed 90 miles right of destination, to be sure to know which way to turn for the Landfall sun PL run in.  He deliberately tried to fly a track about 10 degrees right of the direct line to the island. This required some CN check on the outbound track.  

Chichester assessed drift on 3 headings, to find wind, and flew a drift corrected heading, and amended ETA. The Dalton computer had not then been invented. His own method required plotting on his roller knee pad map, and was most successful, even though he had not swung his compass, and occasionally inadvertently went into cloud because of the head-down plotting. He did not have a turn needle to permit flight in cloud. Strangely, he does not mention surface sea state, an easy way for yachtsmen to assess the Beaufort scale. I did not try to do this in my Stearman.