An indirect fire weapon aiming device (10) is provided for providing aiming information to an indirect fire weapon comprising a launcher mounted to a base. The device (10) includes an angular displacement sensor (12) mountable to the base to provide an angular displacement output, and an azimuth communicator (14) mountable to the launcher to communicate the launcher azimuth to the angular displacement sensor (12) so that the angular displacement sensor (12) can measure the angular displacement of the launcher relative to a reference bearing and provide the angular displacement output.