Boundary marking as your line runs through the woods is a requirement of Farmland Assessment. We recommend painting a ring of visible paint around each tree on your side of the line. This method allows persons on either side of the line to know when they are approaching a boundary.
In addition, paint doesn't have the "disappearing" problem that many posters have when hunting season draws near.
Although we are not licensed surveyors, we do offer boundary maintenance services when we are presented with an adequate survey or deed for a property.