A viewing system includes a detector of electromagnetic radiation (EMR); and a control system connected to receive signals from the detector, and configured to identify an image locator, disposed within a field of view of the detector in use, and select for detection by the detector the image locator or an image located by the image locator. A viewing method includes detecting electromagnetic radiation from an image locator disposed within a field of view of a detector; identifying the image locator with a control system; and displaying the image locator or an image located by the image locator on one or more displays.