🔄 AIS 身分變更追蹤

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What this page shows

本頁追蹤 AIS 身分變更事件——船舶在一段時間內改變船名、MMSI 或船舶類型。 頻繁變更身分是常見的隱匿手法之一，但也可能源於資料錯誤或正常的所有權／註冊變動。

This page tracks AIS identity-change events — vessels that change their name, MMSI, or vessel type within a rolling window. Frequent identity changes are a common concealment tactic, but can also stem from data errors or legitimate ownership / registration changes.

• 以 7 天滾動視窗比對 AIS 廣播的身分欄位。
• Compares AIS-broadcast identity fields over a 7-day rolling window.
• 身分變更偵測每 2 小時更新；變更不等同違規。
• Identity-change detection updates every 2 hours; a change is not itself a violation.