Which statement is true about the relationship between localizers and DME?

Which statement is true about the relationship between localizers and DME?

• A. Not all localizer antennas provide DME
• B. All localizers provide DME
• C. DME is never available with localizers
• D. DME is always on when the localizer is on

Answer: (A)

Localizers provide lateral guidance to help you align with the runway, while DME gives you distance to the ground station. Not every localizer installation includes DME equipment, so you can have a localizer without any distance information. That’s why the true statement is that not all localizer antennas provide DME. If a localizer and DME are paired (LOC/DME), you get both lateral guidance and distance to the station. But many installations are LOC-only, or DME may be provided by a different ground facility, so you won’t always have DME just because the localizer is present. The other options imply universal or mandatory DME with every localizer or that DME is always active with the localizer, which isn’t the case.

Localizers provide lateral guidance to help you align with the runway, while DME gives you distance to the ground station. Not every localizer installation includes DME equipment, so you can have a localizer without any distance information. That’s why the true statement is that not all localizer antennas provide DME.

If a localizer and DME are paired (LOC/DME), you get both lateral guidance and distance to the station. But many installations are LOC-only, or DME may be provided by a different ground facility, so you won’t always have DME just because the localizer is present. The other options imply universal or mandatory DME with every localizer or that DME is always active with the localizer, which isn’t the case.