| Explaination:
Microwave Landing System (MLS) has the following features: 200 channels worldwide. Azimuth coverage is at least ? 40 deg of the runway on-course line (QDM) and glideslopes from .9 deg to 20 deg can be selected. The usable range is 20-30 nm from the MLS site; 20 nm in the UK. There is no problem with back-course transmissions; a secondary system is provided to give overshoot and departure guidance 20 deg of runway direction up to 15 deg in elevation to a range of 10 nm. Operates in the SHF band, 5031 - 5090 MHZ. This enables it to be sited in hilly areas without having to level the site. Course deviation errors (bending) of the localiser and glidepath caused by aircraft, vehicles and buildings are no longer a problem because the MLS scanning beam can be interrupted and therefore avoids the reflections. The MLS has a built-in DME. 
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