y important part of GPS, and the correct answer to the question, the satellites wouldn't work without magnets. And now you, too, know enough to be confused by a simple and straightforward poll question.

(Anticipating a possible comment: the schematic shown is for a Ramsey-type clock, with the atoms interacting with the light field twice. A comment in one of the linked references suggests that the actual GPS clocks may be Rabi-type clocks, with a single large interaction region (though I could be misreading that). I couldn't find a picture of the clocks used in GPS, though, so you'll have to live with this one.)

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