https://www.sciencedaily.com/releases/2021/06/210623141655.htm

Details about the process were published on June 23 in the journal Science Robotics, published by the American Association for the Advancement of Science (AAAS).

The general process, known as visual terrain-relative navigation (VTRN), was first developed in the 1960s. By comparing nearby terrain to high-resolution satellite images, autonomous systems can locate themselves.