AWB used a US Navy sextant for navigating across the Atlantic in 1919, though it is uncertain how this would have been useful as there was no ‘fixed’ horizon.
‘Airship Navigator’ by EA Johnston, recounts the author’s father’s appointment by Daimler Airway to prove that it was possible not to get lost flying on days when the weather wasn’t perfect – the main excuse used by pilots not to fly which went against Frank Searle’s (then) novel idea that aeroplanes only made money when they were in the air.