74 Pa. Stat. § 126
Any person duly registered as a qualified engineer or surveyor under the laws of this Commonwealth or entitled to exemption from registration as an engineer or surveyor under the laws of this Commonwealth, and his duly accredited assistants and representatives may, in the execution of surveys, enter upon any private land whereon there is a marked survey station for which the horizontal or vertical position has been determined by or under the direction of the United States Coast and Geodetic Survey, or which is a part of the Pennsylvania Coordinate System, if such entry is for the purpose of utilizing the horizontal or vertical position data in controlling surveys of land for cadastral purposes, or for other engineering purposes, private or public.
74 P.S. § 126