コスタ・コンコルディア　座礁の経緯

興味深い記事を見つけたのでご紹介します。

まずは、チベタベッキアとサボナの位置関係を把握してください。

つぎに、チベタベッキアとジリオ島の位置関係です。

船はチベタベッキアからサボナへ向けて航行していました。
このマップを頭に入れて置いてくださいね。

Automatic Information System Vessel Traffic records released by Turkish Maritime News web site Denizhaber.com show that the ship seems to have followed an unusual route. After leaving Civitavecchia she took the usual route and a course that would have taken her into deep water between the island of Giglio and the Tuscan mainland.

AISって、ご存知でしょうか？
Automatic Identification System（船舶自動識別装置）
※上の記事中の文言が間違っているのはご愛嬌ということで...記事は引用のままです。
の頭文字をとったものですが、対象物の位置情報をリアルタイムに把握する仕組みといえばいいでしょうか...
300総トン数以上の国際航海する船舶は搭載が義務付けられています。
今回のコンコルディアのAIS情報を、トルコのDenizhaber.comが記録してたんですね。

However, about 7 to 8 nautical miles from that channel she made a course alteration of about 20 degrees, turning to port, on a heading that would have brought her straight onto Giglio Island. She then apparently passed between two rocks to the east of Giglio. The Turkish site thus asks why such a large ship would pass between two rocks when she could have been in deeper water. Why was the ship there and was it due to a mechanical failure? There was also some question about the ship having been on autopilot not long after having left Civitavecchia, when manual control might have been more appropriate that close to land. Whatever the case, those positions and courses have all been recorded and the ship’s black box has been recovered so all of this will become part of the enquiry. Meanwhile, from Marine Traffic we have the following: 20:21 - 15.7 knots, heading 278 - the course that led straight to Giglio 20:29 - 15.4 knots, heading 278 20:33 - 15.4 knots, heading 276 20:37 - 15.3 knots, heading 285 - start of a turn away from the island, now ±1 mile ahead 20:53 - 2.9 knots, heading 351 - now less than 500m from the shore 20:58 - 1.4 knots, heading 007 21:01 - 1.1 knots, heading 013 The change of course and drop in speed between 20:37 and 20:53 would seen to identifty the moments of crisis.

[出典：The Cruise Examiner]

完全に作為的な操船が行われていたっていうことですね。