Interesting just in case system. Hybrid of both GPS and BPS for extra accuracy might have benefits. But from [2 - page 13] four transmission towers, accuracy is within 100 m.<p>[1] <a href="https://nabpilot.org/broadcast-positioning-system-bps/" rel="nofollow">https://nabpilot.org/broadcast-positioning-system-bps/</a><p>[2] <a href="https://www.gps.gov/cgsic/meetings/2023/diamond.pdf" rel="nofollow">https://www.gps.gov/cgsic/meetings/2023/diamond.pdf</a> [pdf]