>Their nav equipment had failed after the engines quit. They had to dead reckon to Iceland. I had read about dead reckoning as a kid in some book, but forgot o

>Their nav equipment had failed after the engines quit. They had to dead reckon to Iceland. I had read about dead reckoning as a kid in some book, but forgot or didn't know what it meant. Looked it up: https://en.wikipedia.org/wiki/Dead_reckoning https://en.wikipedia.org/wiki/Dead_reckoning Both that and the related idea of inertial navigation systems are interesting: https://en.wikipedia.org/wiki/Inertial_navigation_system https://en.wikipedia.org/wiki/Inertial_navigation_system