noted above, OCAS now proposes to exclude air traffic control, aeronautical enroute, and flight test frequencies from AVWS use, which largely addresses these commenters' concerns. See Petition at Exhibits 1, 3-6. Radiodetermination is the determination of the position, velocity and/or other characteristics of an object by means of the propagation of radio waves. 47 C.F.R. § 87.5. 47 C.F.R. §§ 87.471-87.481. 47 C.F.R. § 87.475(a). The applicant must also notify the appropriate FAA Regional Office prior to submitting an application to the Commission. Id. 47 C.F.R. § 87.475(b)(7). A surveillance radar station is a radionavigation land station employing radar to display the presence of aircraft within its range. See 47 C.F.R. § 87.5. See Petition at Appendix at 2. See 47