As mentioned: try dead reckoning first. You need to plot waypoints on a map and figure the bearing and distance to each. Make the waypoints such that you can navigate between them following landmarks (i.e. travel along a road for a distance, then follow a river, then head toward a large building, etc).
To do this, you might use GTFP (which I wrote and is free). It has a detailed map and lets you click to make a waypoint. The output will be a dead-reckoning report you can print and use as you fly (or view in another window on your computer).
You can also use GTFP’s ‘GPS’ to follow the plane in real time. You head the plane to match the waypoint bearing until the distance to the next waypoint falls to zero. Then you continue to the next waypoint in the same manner.