The AN/APQ-174 is an American Ku band radar used on military helicopters for navigation, particularly at low level. It was developed during the late 1980s, as a derivative of the AN/APQ-168 and LANTIRN radars. It was initially procured in the early 1990s for a variety of platforms, including U.S. Army MH-47 Chinooks and MH-60s. The radar can be used for a variety of missions, including: combat search and rescue and special forces insertion and extraction. Angular scan times are 5.5º/sec and the weather mode is improved during heavy rain by the use of circular polarization.