Exploring a remote Vermont spot

We have access to a secret spot in Vermont. To get there, you drive up a dirt road to a class 4 dirt road to another class four road. From there, you walk into the woods. We have been told by several people there's a spring there. We looked for it. The compass we had was not great. The digital map stopped tracking in several spots with no signal. We'll come back and try it again; how would you find a spring on a 100-acre piece of land?