In general for the ILS, the glideslope intercept will be at the approximate position of the outer marker or 4-7 miles from the threshold.
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Most of the time, yes. Sometimes we might take a visual approach, but that's rare especially at the big airports who will guide you through radar vectors to an ILS under strict speed control, but even if we do carry out a rare visual approach, if the ILS is up and running we can still use that for extra guidance.