Which of the following is NOT listed as a terrestrial backup for space support?

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Multiple Choice

Which of the following is NOT listed as a terrestrial backup for space support?

Explanation:
The idea being tested is telling apart ground-based backups from space-based assets. Terrestrial backups are systems on Earth that can support navigation or timing without relying on spacecraft. VOR beacons are ground-based navigation aids used by aircraft, LORAN-C is a long-range ground-based radio navigation system, and atomic clocks are precise time references deployed on land. GPS satellites, however, are in space—their navigation and timing services come from orbiting satellites. Since a terrestrial backup must be ground-based, GPS satellites do not fit that category.

The idea being tested is telling apart ground-based backups from space-based assets. Terrestrial backups are systems on Earth that can support navigation or timing without relying on spacecraft. VOR beacons are ground-based navigation aids used by aircraft, LORAN-C is a long-range ground-based radio navigation system, and atomic clocks are precise time references deployed on land. GPS satellites, however, are in space—their navigation and timing services come from orbiting satellites. Since a terrestrial backup must be ground-based, GPS satellites do not fit that category.

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