An Astro Fix (determination of latitude and longitude at the point where the observations to the stars were made), would last on average from three to four days, with observations over two or three nights of about 5 to 6 hours a night. The computations were carried out during the day. (Now, someone who knows nothing about surveying, let alone astronomy, armed with a GPS costing a few hundred pounds, can achieve a far more accurate result in a few minutes.)
The crew would stay in the bush for anything from a week to three weeks before returning to base camp for rest and replenishment.
