Richard Byrd claimed to have reached the North Pole in his 1926 flight, based mostly on his dead reckoning navigation. His technique of finding distance traveled from observations with a drift indicator can ideally be quite accurate, as shown by simulations of his dead reckoning with a navigation log. But under real-world conditions, especially those of Byrd's flight, significant errors can easily occur. Since we do not have a copy of Byrd's navigation log from the flight, we cannot assess such errors, and there is some evidence that Byrd did not keep a navigation log. However, that would not necessarily lead to less accurate dead reckoning.