Abstract: A golfer wishing to know the distance to a specified feature on a golf course, operates a portable interrogation unit, to enter a request for the distance to the location of the feature. Transmitters located to define a triangle encompassing a substantial portion of the course transmit ranging signals, which are received by the portable interrogation unit. The portable interrogation unit includes a memory which stores the locations of the transmitters and the locations of predetermined features on the course and a CPU which processes the ranging signals received from the transmitters to determine the location of the portable interrogation unit and further to determine the distance from the portable unit to the specified feature. The portable interrogation unit then displays the determined distance. To survey the locations of the various predetermined features on the course, a portable survey unit is substituted for the portable interrogation unit.

Abstract: A golfer wishing to know the distance to a specified feature on a golf course, such as the pin on the next green, operates a portable interrogation unit, which transmits an interrogation signal including a request for the distance to the location of the specified feature. Three remote stations located to define a triangle encompassing a substantial portion of the course receive the interrogation signal and communicate interrogation information signals to a central station. The interrogation information signals include the interrogation signal data, remote station identification data, and pertaining to the location of the source of the interrogation signal relative to the remote station.