The CAUTION box on sectional charts denotes which hazard to aircraft?

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Multiple Choice

The CAUTION box on sectional charts denotes which hazard to aircraft?

Explanation:
CAUTION boxes flag unmarked hazards to navigation that could catch pilots by surprise. In this case, the box indicates a tethered balloon on a cable that isn’t marked on the ground, with the hazard reaching up to 3,008 feet MSL. That altitude tells you the maximum vertical extent of the balloon and its cable, so you’d avoid the area up to that level. Weather balloons, low-altitude aircraft, or obstruction-light outages aren’t depicted with this CAUTION symbol, and their representations on charts look different. The key idea is that the CAUTION box warns of an unmarked, suspended hazard like a tethered balloon.

CAUTION boxes flag unmarked hazards to navigation that could catch pilots by surprise. In this case, the box indicates a tethered balloon on a cable that isn’t marked on the ground, with the hazard reaching up to 3,008 feet MSL. That altitude tells you the maximum vertical extent of the balloon and its cable, so you’d avoid the area up to that level. Weather balloons, low-altitude aircraft, or obstruction-light outages aren’t depicted with this CAUTION symbol, and their representations on charts look different. The key idea is that the CAUTION box warns of an unmarked, suspended hazard like a tethered balloon.

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