Subtense Valley (77°50′S 160°6′E) is a mostly ice-free valley, 1.5 nautical miles (2.8 km) long, located 2 nautical miles (3.7 km) northwest of Tabular Mountain in the west extremity of Quartermain Mountains, Victoria Land. The name is one of a group in the area associated with surveying applied in 1993 by New Zealand Geographic Board (NZGB). A subtense bar is a fixed base (usually 2 meters long) used in conjunction with a theodolite in the calculation of horizontal distance.
This article incorporates public domain material from the United States Geological Survey document "Subtense Valley" (content from the Geographic Names Information System).
References
Subtense Valley Wikipedia(Text) CC BY-SA