"back bearing" meaning in English

{
  "forms": [
    {
      "form": "back bearings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back bearing (plural back bearings)",
      "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": "topical",
          "langcode": "en",
          "name": "Navigation",
          "orig": "en:Navigation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A bearing taken pointing to the exact opposite direction to the direction heading"
      ],
      "id": "en-back_bearing-en-noun-lwDWZlkr",
      "links": [
        [
          "navigation",
          "navigation"
        ],
        [
          "bearing",
          "bearing"
        ]
      ],
      "qualifier": "navigation",
      "raw_glosses": [
        "(navigation) A bearing taken pointing to the exact opposite direction to the direction heading"
      ]
    }
  ],
  "word": "back bearing"
}

{
  "forms": [
    {
      "form": "back bearings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back bearing (plural back bearings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Navigation"
      ],
      "glosses": [
        "A bearing taken pointing to the exact opposite direction to the direction heading"
      ],
      "links": [
        [
          "navigation",
          "navigation"
        ],
        [
          "bearing",
          "bearing"
        ]
      ],
      "qualifier": "navigation",
      "raw_glosses": [
        "(navigation) A bearing taken pointing to the exact opposite direction to the direction heading"
      ]
    }
  ],
  "word": "back bearing"
}