Final answer:
The explorer was sailing in the horse latitudes, characterized by high pressure and little wind.
Step-by-step explanation:
The explorer was sailing in the horse latitudes which are characterized by high pressure and little wind. The horse latitudes are located around 30 degrees north and south of the equator. In these regions, warm air from the equator descends, creating high pressure and calm winds. This can be challenging for sailors.
Learn more about Global wind patterns