"fan marker" meaning in English

{
  "forms": [
    {
      "form": "fan markers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fan marker (plural fan markers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Aviation",
          "orig": "en:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Navigation",
          "orig": "en:Navigation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "inner marker"
        },
        {
          "word": "middle marker"
        },
        {
          "word": "outer marker"
        }
      ],
      "glosses": [
        "An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "hypernyms": [
        {
          "word": "marker beacon"
        }
      ],
      "id": "en-fan_marker-en-noun-KOc8girZ",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "obsolescent",
          "obsolescent"
        ],
        [
          "marker beacon",
          "marker beacon"
        ],
        [
          "en route",
          "en route"
        ],
        [
          "airway",
          "airway"
        ],
        [
          "non-precision approach",
          "non-precision approach"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation) An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "synonyms": [
        {
          "word": "FM"
        }
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "Marker beacon#Fan marker"
      ]
    }
  ],
  "word": "fan marker"
}

{
  "coordinate_terms": [
    {
      "word": "inner marker"
    },
    {
      "word": "middle marker"
    },
    {
      "word": "outer marker"
    }
  ],
  "forms": [
    {
      "form": "fan markers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fan marker (plural fan markers)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "marker beacon"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Aviation",
        "en:Navigation"
      ],
      "glosses": [
        "An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "obsolescent",
          "obsolescent"
        ],
        [
          "marker beacon",
          "marker beacon"
        ],
        [
          "en route",
          "en route"
        ],
        [
          "airway",
          "airway"
        ],
        [
          "non-precision approach",
          "non-precision approach"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation) An obsolescent type of marker beacon, usually used to mark en route airways but occasionally used as part of a non-precision approach, which radiates in a pattern that is considerably wider, from the perspective of an aircraft approaching the marker along the airway, than it is long (allowing an aircraft to pick up the signal from the marker even if slightly to one side of the airway's centerline)."
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "Marker beacon#Fan marker"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "FM"
    }
  ],
  "word": "fan marker"
}