The FAA states that when a tower of any kind exceeds the height of 200' or higher a 1A or 2C certification is required. This is to verify height, and position which is particularly important for the safety of aircrafts.

1A's Tolerance is 20 feet vertically, and 3 feet horizontally.

2C's Tolerance is 50 feet vertically, and 20 feet horizontally.

McCann Land Surveyors pioneered surveying Towers and Telecommunication improvements since 1981. We would enjoy the opportunity to contribute to your Professional Survey needs.