  Measuring the single transverse spin asymmetry $A_N$ for large $x_F$
Drell-Yan production provides the most robust test of our current theoretical
understanding of transverse proton spin structure. This includes a measurement
of the predicted sign change of the Sivers function in comparison to that found
in SIDIS data. The first year of a feasibility test has been completed to
define the requirements for measuring large $x_F$ Drell-Yan production at RHIC.
The impact of colliding beams at a third IR at RHIC was found to be negligible
and a rich jet-triggered data sample was acquired by AnDY in RHIC Run 11. Plans
for subsequent runs are currently underway.
