  The origins of S0 galaxies remain obscure, with various mechanisms proposed
for their formation, likely depending on environment. These mechanisms would
imprint different signatures in the galaxies' stellar kinematics out to large
radii, offering a method for distinguishing between them. We aim to study a
sample of six S0 galaxies from a range of environments, and use planetary
nebulae (PNe) as tracers of their stellar populations out to very large radii,
to determine their kinematics in order to understand their origins. Using a
special-purpose instrument, the Planetary Nebula Spectrograph, we observe and
extract PNe catalogues for these six systems*. We show that the PNe have the
same spatial distribution as the starlight, that the numbers of them are
consistent with what would be expected in a comparable old stellar population
in elliptical galaxies, and that their kinematics join smoothly onto those
derived at smaller radii from conventional spectroscopy. The high-quality
kinematic observations presented here form an excellent set for studying the
detailed kinematics of S0 galaxies, in order to unravel their formation
histories. We find that PNe are good tracers of stellar kinematics in these
systems. We show that the recovered kinematics are largely dominated by
rotational motion, although with significant random velocities in most cases.
