This is a comment on an article by Thomas E. Phipps, Jr., that has appeared in this journal [Phys. Essays 27 , 591 (2014)]. He reconfirmed that Maxwell equations are Galilean invariant. The global positioning system (GPS) uses the collective time (GPS clock). Phipps refuted Lorentz length contraction, and noted that covariance has been consistently banished in favor of invariance; furthermore, he concluded that spacetime symmetry is invalidated. Phipps did not accept the existence of an ether. On this point, we do not agree with him and assume the ether as a preferred reference frame. We recommend that Phipps's invariant physics should be studied.