Pretty wild that they had to use one of the Payloads from NASA to complete the landing since the onboard Nav system failed.
"In the home stretch of its touchdown try today, however, the lander's handlers discovered that Odysseus' laser rangefinders, which allow it to determine its altitude and horizontal velocity, weren't working properly. So the team pressed NASA's experimental NDL payload into service for this vital function, pushing the landing try back by two hours to put the new plan into action.This last-minute workaround — which required the team to design a software patch on the ground and beam it up to Odysseus — did the trick. At 6:11 p.m. EST (2311 GMT) today, Odysseus fired up its main engine for a crucial 11-minute burn that slowed the craft's descent toward the lunar surface. Then, at 6:23 p.m. EST (2353 GMT), Odysseus touched down softly near the rim of the crater Malapert A, about 190 miles (300 kilometers) from the lunar south pole. .....
"The NASA instruments, which cost the agency an additional $11 million to develop, are designed to conduct a variety of investigations. For instance, one of them, called NDL ("Navigation Doppler Lidar for Precise Velocity and Range Sensing") used LIDAR (light detection and ranging) technology to collect data during descent and landing. NDL turned out to be vital to today's touchdown, as you'll see below."
