Charlie and John were startled by their landing spot. Much of the landing area was covered with rocks or had a steep slope. Fortunately, they had managed to land on the only level and smooth spot around.
“There you are, our mysterious and unknown Descartes Highlands Plains. Apollo 16 is gonna change your image.” John Young
Due to the change in their flight plan caused by the six-hour delay, the crew had to reprogram a great deal of their onboard data, and this had to be done before they had LOS.
In the event of a secondary control system failure in the engine, the mission rules stated the entire landing phase of the mission would have to be terminated.