Systems and methods for guiding a sensor to locate a source of a propagating wave. The methods involve: presenting an electronic display comprising an image representing an object in which the sensor is placed and a visual indicator representing the sensor; receiving signals generated by electrodes while the sensor resides at a first location in the object; determining a First Recommended Direction of Travel (“FRDT”) for the sensor based on the received signals; using the FRDT to generate a mask that is to cover at least a portion of the image representing a portion of the object that is absent of the source; and modifying the electronic display to include the mask overlaid on top of the image and an arrow showing FRDT.