A system, comprising: an acoustic probe having an array of acoustic transducer elements; and an acoustic imaging instrument connected to the acoustic probe and configured to provide transmit signals to least some of the acoustic transducer elements to cause the array of acoustic transducer elements to transmit an acoustic probe signal to an area of interest, and further configured to produce acoustic images (430a, 702, 800) of an image plane of the area of interest in response to acoustic echoes received from the area of interest in response to the acoustic probe signal, the acoustic imaging instrument including: a display device configured to display the acoustic images of the image plane in the area of interest; a receiver interface configured to receive a sensor signal from a passive sensor disposed on a surface of an intervention device disposed in the area of interest, the sensor signal being produced in response to the acoustic probe signal, wherein the passive sensor is located at a fixed distance from a tip of the intervention device; and a processor configured to: identify an estimated location of the passive sensor from the sensor signal, wherein the system is characterized in that the processor is further configured to: ascertain an approximate angular orientation of the intervention device with respect to the image plane, and ascertain an estimated range of locations of a projection of the tip location of the intervention device with respect to the image plane, using the estimated location of the passive sensor, the approximate angular orientation of the intervention device with respect to the image plane, and the fixed distance from the passive sensor to the tip of the intervention device, wherein the display device is further configured to display a marker (22-7a, 22-7a2, 22-8b, 22-8c, 22-8d2) to indicate on the acoustic images the estimated range of locations of the projection of the tip location of the intervention device with respect to the image plane. an acoustic probe having an array of acoustic transducer elements; and an acoustic imaging instrument connected to the acoustic probe and configured to provide transmit signals to least some of the acoustic transducer elements to cause the array of acoustic transducer elements to transmit an acoustic probe signal to an area of interest, and further configured to produce acoustic images (430a, 702, 800) of an image plane of the area of interest in response to acoustic echoes received from the area of interest in response to the acoustic probe signal, the acoustic imaging instrument including: a display device configured to display the acoustic images of the image plane in the area of interest; a receiver interface configured to receive a sensor signal from a passive sensor disposed on a surface of an intervention device disposed in the area of interest, the sensor signal being produced in response to the acoustic probe signal, wherein the passive sensor is located at a fixed distance from a tip of the intervention device; and a processor configured to: identify an estimated location of the passive sensor from the sensor signal, wherein the system is characterized in that the processor is further configured to: ascertain an approximate angular orientation of the intervention device with respect to the image plane, and ascertain an estimated range of locations of a projection of the tip location of the intervention device with respect to the image plane, using the estimated location of the passive sensor, the approximate angular orientation of the intervention device with respect to the image plane, and the fixed distance from the passive sensor to the tip of the intervention device, a display device configured to display the acoustic images of the image plane in the area of interest; a receiver interface configured to receive a sensor signal from a passive sensor disposed on a surface of an intervention device disposed in the area of interest, the sensor signal being produced in response to the acoustic probe signal, wherein the passive sensor is located at a fixed distance from a tip of the intervention device; and a processor configured to: identify an estimated location of the passive sensor from the sensor signal, identify an estimated location of the passive sensor from the sensor signal, wherein the system is characterized in that the processor is further configured to: ascertain an approximate angular orientation of the intervention device with respect to the image plane, and ascertain an estimated range of locations of a projection of the tip location of the intervention device with respect to the image plane, using the estimated location of the passive sensor, the approximate angular orientation of the intervention device with respect to the image plane, and the fixed distance from the passive sensor to the tip of the intervention device, ascertain an approximate angular orientation of the intervention device with respect to the image plane, and ascertain an estimated range of locations of a projection of the tip location of the intervention device with respect to the image plane, using the estimated location of the passive sensor, the approximate angular orientation of the intervention device with respect to the image plane, and the fixed distance from the passive sensor to the tip of the intervention device, wherein the display device is further configured to display a marker (22-7a, 22-7a2, 22-8b, 22-8c, 22-8d2) to indicate on the acoustic images the estimated range of locations of the projection of the tip location of the intervention device with respect to the image plane.