The sea dye marker is a lifesaving device used for sea rescue. This product is procured by the United States armed services for use on all military aircraft and vessels conforming to MIL-S-17980D specifications. The marker is also purchased by boat owners for additional protection in case of emergencies.
The marker contains a fluorescent green dye that spreads over the surface of the water so as to increase visibility for a rescue pilot to see. The marker can easily be placed in a life vest pocket or life raft safety kits.
The bright green pattern on the water can be seen for a mile or more and lasts for 30 to 40 minutes. Wind and the choppiness of the water will affect the shape of the pattern.
A field test study was done by Powerboat Reports in its October 1995 issue. Flares, steamers, mirrors and smoke flares were tested, as well as the dye marker. Powerboat judged the marker was the most effective tool for sea rescue.
One should always remember that in the event of an emergency on the open seas, it is important to have as many rescue devices as possible on hand.

海染標記是一種用於海上救援的救生裝置。此產品由美國武裝部隊採購，用於所有符合MIL-S-17980D規範的軍用飛機與艦艇。船主也會購買此標誌，以備緊急狀況時的額外保護。標記內含有螢光綠色染料，會均勻塗抹在水面，以增加救援飛行員的能見度。標記器可以輕鬆放入救生衣口袋或救生筏安全套件中。水面上鮮綠色的圖案可見一英里以上，持續30至40分鐘。風和水面的波浪會影響圖案的形狀。

Powerboat Reports 於 1995 年 10 月號進行了實地測試研究。測試了照明彈、蒸汽器、鏡子和煙霧彈，以及染料標記。動力艇認為該標記是海上救援最有效的工具。人們應該時刻記得，在公海上發生緊急狀況時，盡可能多準備救援設備非常重要。