Presented herein are echo location techniques to obtain information about an implantable component of a hearing prosthesis relative to a recipient's tissue. The hearing prosthesis may comprise an elongate stimulating assembly configured to be implanted in a recipient's where an echo transmitter is disposed in the stimulating assembly. The echo transmitter is configured to emit an energy pulse within the recipient and an echo receiver disposed in the stimulating assembly is configured to detect a portion of the energy pulse reflected from tissue of the recipient.