A method and apparatus for determining the location of an object with a sensor positions an instrument at a first location, controls the instrument to transmit a first omnidirectional signal during a first time, and determines a first distance from the instrument to the static object using the first omnidirectional signal. The method and apparatus repeats this process in a serial manner at two other locations, and uses the respective distances from each location to determine the location of the object. Other embodiments are disclosed.