LOCALIZER COURSE [ICAO]- The locus of points, in any given horizontal plane, at which the DDM (difference in depth of modulation) is zero.
Know the dimensions of the localizer course.
2. Intercept and descend on localizer before reaching the marker.
3. Set power and trim for stabilized approach airspeed.
4. Keep track of where you are and what to expect.
5.
Back course (BC). The reciprocal of the localizer course for an ILS. When flying a back-course approach, an aircraft approaches the instrument runway from the end at which the localizer antennas are installed.
  
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