system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how are hot-air balloons navigated?
gpt
Aviators weather reports will provide anticipated wind speed and direction at different altitudes, so to some extent you can control which prevailing wind you are in by changing altitude. In general though, you are entirely at the mercy of the wind, so ballon journeys are hops in a single direction planned in advance in accordance with the wind direction.