The terminology is different between ICAO and the US.
The following definitions are being used by Jeppesen (Introduction to Jeppesen Navigation Charts):
FINAL APPROACH FIX (FAF) — The fix from
which the final approach (IFR) to an airport is executed and which identifies the beginning of the final
approach segment. It is designated in the profile
No. You intercept the GS long before FAP.
The FAF/FAP mark the beginning of the last segment. FAF is used for non-precision (non-glideslope) approaches, and FAP for ILS approaches.
The FAP is usually indicated by a Maltese Cross symbol. In the absence of that, the best clue that a fix on an ILS is the FAP is the GS crossing altitude indication.
An IF is any fix between the IAF and FAF, so as a matter of logic, the same fix cannot be both an IAF and an IF at the same time. Therefore the label IAF/IF must mean it can be either one or, in some cases, both at different times.
If you are cleared to ACZUP for the straight-in approach, then ACZUP is the IAF only. You never pass it a second time, so it ...
One tick mark along a horizontal grid line on a sectional chart denotes one minute of longitude. At the equator (but nowhere else), this is also equal to one nautical mile. The further from the equator, the less the distance that is spanned by one minute of longitude.
One tick mark along a vertical grid line on a sectional chart denotes one minute of ...