Once you cast it, Intuit Direction is unneccessary. You instantly know which direction is true north, and judging from that you surmise that the trail lies south of your current position. It seems the Zhentarim were striking out across the Stonelands, headed northeast.
"We're not dividing all that treasure amongst these people...they were the ones so gung-ho to take the dangerous route. Let this be their lesson," says Quidam.