Before you depart, try to plot 10 minute markers on forecast wind. Then as soon as you can, identify a fix on track, or close to and abeam, circle it and write a time, continue to do so every 5, 10 or so minutes. Then, if you've held a constant heading (very important, you will be able to do a grounspeed check using a plotter and your CR-2/wizzwheel. Then recalcualte from your present, known position. Then if as you say you do, get in the general area, and still can't see it, perhaps get down lower to identify smaller features, read the road signs, or stop and ask directions
Good luck, alternatively contact Casio (?) for one of their GPS watches