Subspace scans were part of the routine bridge scans seen on monitors aboard the USS Enterprise-B. (Star Trek Generations, display graphic) Wesley Crusher replayed Ferengi transmissions when he supposed a coded signal in one of the subspace scans. (TNG: "Ménage à Troi" ) When Geordi La Forge's VISOR was somehow malfunctioning, Captain Picard ordered to run a localized subspace scan. (TNG: "Cause and Effect" ) Due to Worf's concerns about the different timeline he experienced, Data initiated a subspace scan to search for temporal anomalies on and off the ship. (TNG: "Parallels" )