{
  "added_at": "2026-11-08",
  "additional_evidence_urls": [
    "https://github.com/ThePhantomPuppet/navico-gofree-protocol/blob/0757d0bfc74fe2cd5d7a7f949626c299525be4fb/docs/protocol-overview.md"
  ],
  "category": "reconstruction-cases",
  "class": "hardware",
  "description_en": "Navico GoFree records screen-mirroring protocol behavior observed on a Simrad NSS12 evo3 marine display. It maps UDP multicast discovery at 239.2.1.1:2052, the TCP connection on port 6633 that enables video output, and the RTSP /screenmirror endpoint, with small client probes.",
  "description_zh": "Navico GoFree 记录在 Simrad NSS12 evo3 船用显示设备上观察到的屏幕镜像协议。文档梳理了 239.2.1.1:2052 的 UDP 组播发现、使视频输出生效的 6633 端口 TCP 连接，以及 RTSP /screenmirror 端点，并附有探测脚本。",
  "entry_url": "https://awesomerea.org/resources/navico-gofree-protocol-case/",
  "entry_url_zh": "https://awesomerea.org/zh/resources/navico-gofree-protocol-case/",
  "evidence_class": 2,
  "evidence_status": "observed",
  "evidence_url": "https://github.com/ThePhantomPuppet/navico-gofree-protocol/blob/0757d0bfc74fe2cd5d7a7f949626c299525be4fb/README.md",
  "group": "cases",
  "id": "navico-gofree-protocol-case",
  "json_url": "https://awesomerea.org/resources/navico-gofree-protocol-case/record.json",
  "kind": "case-study",
  "markdown_url": "https://awesomerea.org/resources/navico-gofree-protocol-case/index.md",
  "markdown_url_zh": "https://awesomerea.org/zh/resources/navico-gofree-protocol-case/index.md",
  "name": "Navico GoFree: screen-mirroring protocol findings",
  "name_zh": "Navico GoFree：屏幕镜像协议分析",
  "record_type": "resource",
  "relationship": "independent-reconstruction",
  "requirement_facets": [
    "prerequisites",
    "limits",
    "license"
  ],
  "requirements": [
    "Requires a compatible GoFree marine display and access to its Wi-Fi network.",
    "Observations are primarily from a Simrad NSS12 evo3; behavior on other models needs confirmation.",
    "MIT License."
  ],
  "requirements_zh": [
    "需要兼容的 GoFree 船用显示设备及其 Wi-Fi 网络访问权限。",
    "观察结果主要来自 Simrad NSS12 evo3；其他型号的行为仍需确认。",
    "MIT 许可证。"
  ],
  "scope": "unknown",
  "targets": [
    "protocol"
  ],
  "url": "https://github.com/ThePhantomPuppet/navico-gofree-protocol",
  "verification": "source-reviewed",
  "verified_at": "2026-11-06"
}