战术空中导航系统（英语：Tactical Air Navigation, TACAN，简称塔康），通常系由军队使用。塔康为用户提供目的地（航母、空军基地等）的方位和斜距，塔康可以说是民航用途DME/VOR的军用高端版。而搭载VOR和TACAN的VORTAC系统中，其他飞机可以使用其提供的DME信息作为着陆参考。配备了塔康设备的飞机则可以以其作非精确进场着陆的导航。美国NASA的航天飞机就是特别设计于返回着陆时以设备作非精确进场着陆，但现在已经由GPS系统取代。****的**/海巡署就在太平岛配备了可移动塔康系统。

A tactical air navigation system, commonly referred to by the acronym TACAN, is a navigation system used by military aircraft. It provides the user with bearing and distance (slant-range) to a ground or ship-borne station. It is a more accurate version of the VOR/DME system that provides bearing and range information for civil aviation. The DME portion of the TACAN system is available for civil use; at VORTAC facilities where a VOR is combined with a TACAN, civil aircraft can receive VOR/DME readings. Aircraft equipped with TACAN avionics can use this system for en route navigation as well as non-precision approaches to landing fields. The space shuttle is one such vehicle that was designed to use TACAN navigation but later upgraded with GPS as a replacement.