Means capturing signals occurring naturally from the environment, e.g. ambient optical, acoustic, gravitational or magnetic signals (using passive navigation aids external to the vehicle G05D1/244; using signals from positioning sensors located off-board the vehicle G05D1/249)

Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots > Control system inputs > Arrangements for determining position or orientation > Means capturing signals occurring naturally from the environment, e.g. ambient optical, acoustic, gravitational or magnetic signals

Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots (drive control systems specially adapted for autonomous road vehicles B60W60/00) > Control system inputs > Arrangements for determining position or orientation > Means capturing signals occurring naturally from the environment, e.g. ambient optical, acoustic, gravitational or magnetic signals (using passive navigation aids external to the vehicle G05D1/244; using signals from positioning sensors located off-board the vehicle G05D1/249)