  Boasting supreme magnetic strengths, magnetars are among the prime candidates
to generate fast radio bursts. Several theories have been proposed for the
formation mechanism of magnetars, but have not yet been fully tested. As
different magnetar formation theories expect distinct magnetar space velocity
distributions, high-precision astrometry of Galactic magnetars can serve as a
probe for the formation theories. In addition, magnetar astrometry can refine
the understanding of the distribution of Galactic magnetars. This distribution
can be compared against fast radio bursts (FRBs) localized in spiral galaxies,
in order to test the link between FRBs and magnetars. Swift J1818.0-1607 is the
hitherto fastest-spinning magnetar and the fifth discovered radio magnetar. In
an ongoing astrometric campaign, we have observed Swift J1818.0-1607 for one
year using the Very Long Baseline Array, and have determined a precise proper
motion as well as a tentative parallax for the magnetar.
