Note: They are only used on a few instrument approaches anymore, to mark positions along the inbound course, when there is only one marker present: for an example, see the LOC-D document for Gillespie Field(PDF), effective 23 Jan 2025 - here GRIGG is a fan marker. Quote regarding marker beacons –from an old edition of AIM, section 1-1-9.
Note: They are only used on a few instrument approaches anymore, to mark positions along the inbound course, when there is only one marker present: for an example, see the LOC-D document for Gillespie Field(PDF), effective 23 Jan 2025 - here GRIGG is a fan marker. Quote regarding marker beacons –from an old edition of AIM, section 1-1-9.
