A GS is projection is usually adjusted for a 3° glide path so that it intersects the middle marker (MM) at around 200ft and the outer marker (OM) at around 1,400ft above runway elevation. The GS signal emits in the direction of the LOC front course and the frequency is paired with the LOC frequency. It helps keep guide you down from the FAF to the DA. The glide slope (GS) is the component of the ILS that gives vertical guidance to keep a proper path down to the runway. Both of which have different frequencies and different morse code identifiers. The LOC for RWY 18 is identified by I-PIE and the LOC for RWY 36 is identified by I-CWT. So for example, in KPIE there are 2 ILSs. All LOCs will have a 4 letter code identifiers, all starting with an I. This is good for identifying the LOC’s morse code. You can receive a signal outside of these limits, but they it is not considered reliable. This applies to bother the front and back course. The normal reliable coverage of the LOC is 35° on either side of the course centerline up to 10nm front the transmitter and then 10° of either side up to 18nm. We will focus on the front course for now and talk about the back course later. Looking at Image 1 (ignore my horrible drawing) you can see both the front course and the back course of the transmitting range. The LOC antenna is located at the far end of the runway departure end. This is what gives the pilot navigation assistance to stay lined up with the runway centerline. The localizer (LOC) gives lateral navigation.
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