National Dataset

National Navigation Aids and Obstacles


Location, height and description of infrastructure, markers or other devices on land which may aid travellers in determining their position or safe course.

Dataset Purpose

This dataset is also known as vertical obstructions or vertical obstacles due to the importance of this information for aeronautical safety as pilots must chart courses that maintain a lowest safe altitude above on-ground obstacles.

Navigation aids and obstacles on land include:

  • Transmission lines
  • Buildings
  • Radio towers and masts
  • Skyscrapers and other tall structures
  • Chimneys on power plants

Use Case