5. The localizer provides course guidance throughout the descent path to the runway threshold from a distance of 18 NM from the antenna between an altitude of 1,000 feet above the highest terrain along the course line and 4,500 feet above the elevation of the antenna sight. Proper off-course indications are provided throughout the following angular areas of the operational service volume:
(a) To 10 degrees either side of the course along a radius of 18 NM from the antenna, and
(b) from 10 to 35 degrees either side of the course along a radius of 10 NM [...]
6. Unreliable signals may be received outside these areas.
3. The glode path projection angle is normally adjusted to 3 degrees above horizontal sothat it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation. The glide slope is normally usable to the distance of 10 NM. However, at some locations, the glide slope has been certified for an extended service volume which exceeds 10 NM.