House Bill 571 revises aeronautics laws in Montana concerning the use of Automatic Dependent Surveillance-Broadcast (ADS-B) systems. The bill prohibits any entity, including government divisions and private companies, from using information broadcast or collected by ADS-B systems to calculate, generate, or collect fees from aircraft owners or operators within the state. This restriction specifically applies to aircraft defined as having a gross weight of 9,000 pounds or less and operating under Title 14, part 91 of the Code of Federal Regulations.

Additionally, the bill provides definitions for key terms related to the legislation. "Aircraft" is defined in accordance with existing law but is limited to lighter aircraft, while "Automatic dependent surveillance-broadcast" is described as a technology that enhances aviation surveillance by integrating an aircraft's positioning data with ground infrastructure. The bill aims to ensure that the use of ADS-B data does not lead to financial burdens on aircraft operators in Montana.