Southaces suggestion did not work, but FreeRadicals link was just as easy and I managed to realign the smart pilot. Now I am sailing forwards again and not backwards.
I did not 'swing' the compass again to find the variation. When I went into the calibration mode of the unit, the variation was correct, so all I had to do was to slew the heading to match the magnetic compass. Now I should have heading (true/magnetic, my plotter is actually set to magnetic) and CoG or track.
Whist following the link that FR supplied was easy to calibrate the unit, it was not as straight forward as "pressing a few buttons". So I think the kids are off the hook on this one
