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In their Letter, Kentosh and Mohageg [Phys. Rev. Lett. 108, 110801 (2012)]seek to use data from clocks aboard global positioning system (GPS) satellitesto place limits on local position invariance (LPI) violations of Planck'sconstant, h. It is the purpose of this comment to show that discussing limitson variation of dimensional constants (such as h) is not meaningful; that evenwithin a correct framework it is not possible to extract limits on variation offundamental constants from a single type of clock aboard GPS satellites; and tocorrect an important misconception in the authors' interpretation of previousEarth-based LPI experiments.

Comment on "Global Positioning System Test of the Local Position Invariance of Planck's Constant"