A system for monitoring an approach to a target includes a luminal device including a distal portion, a sensor coupled to the distal portion of the luminal device, and a surgical instrument including one or more indicators having a detectable property located along at least a portion of the surgical instrument. The luminal device is configured to be inserted into a patient, and the distal portion of the luminal device is configured to be guided proximate a target. The sensor is configured to sense the detectable property of the one or more indicators. The surgical instrument is configured to be guided through the luminal device.
