Out of interest, next time out have a look at the windspeed readout on the landing roll. The IRS could not sense drift on the runway (hopefully...!), so it's out of date to a certain degree. I just wonder how much.
That degree being that your are now heading your track. The only wind on your ND then is the difference between airspeed and groundspeed. A quick glance gives you a good idea of the exact headwind (tailwind) component.
