Captain Leslie Simpson, the pilot of a flight on 14 November and also present at the 9 November briefing, compared the coordinates of the McMurdo TACAN navigation beacon (approximately 5 kilometres east of McMurdo NDB), and the McMurdo waypoint that his flight crew had entered into the INS (Inertial Navigation System), and was surprised to find a large distance between the two.
O capitán Leslie Simpson, o piloto do voo o 14 de novembro e tamén presente no briefing do 9 de novembro, comparou as coordenadas da baliza de navegación TACAN de McMurdo (a uns 5 km ao leste da baliza non direccional de McMurdo), e o punto de referencia de McMurdo que a súa tripulación introducira no INS (Sistema Inercial de Navegación), e quedou sorprendido ao atopar unha gran distancia entre os dous.