What altitude should a pilot maintain over open water or sparsely populated areas?

The correct altitude to maintain over open water or sparsely populated areas is 1,000 feet AGL (Above Ground Level). This standard altitude is established for safety reasons, ensuring that pilots have sufficient altitude to execute emergency procedures if necessary, while also minimizing risk to persons and property on the ground.

In general aviation practices, the Federal Aviation Administration (FAA) requires pilots to fly at least 1,000 feet above the terrain over open water and sparsely populated areas to provide a safety buffer. This altitude allows for ample response time to any unforeseen circumstances, such as engine failure or other emergency situations where descending rapidly would be necessary.

Although the option mentioning 500 feet from any structure pertains to overflight regulations in more populated regions, it does not apply to open water or sparsely populated areas where 1,000 feet AGL is more appropriate, as there are typically no structures to maintain distance from. Therefore, 1,500 feet AGL and 700 feet AGL do not align with the prescribed regulations for safety over such environments.

Overall, 1,000 feet AGL is the recommended altitude that balances safety for the pilot and the surrounding areas.