Obstacle warning system
The FLARM Obstacle Warning System alerts pilots of fixed obstacles such as powerlines, cable cars, and antenna towers that could pose a danger to aircraft. Obstacle databases can be installed in all major FLARM devices, including OEM products. To enable it, a database file for the relevant region with a valid license is installed in the device
Flarm maintains these databases for Europe. Garmin et al would do well to develop similar databases for North America and integrate with terrain warning.