Breizh Reconnaissance Orbiter (BRO) is a low Earth orbit satellite constellation developed by the French company Unseenlabs, headquartered in Rennes, Brittany, with the support of the French Ministry of Research and Innovation. BRO is focused on radio frequency spectrum monitoring and signal intelligence for maritime and aerial traffic surveillance. The 6U and 8U CubeSat-type small satellites are built by the Danish company GomSpace. The first BRO satellite, BRO-1, was launched in August 2019 on a Rocket Lab Electron rocket.