drift card

drift card

[′drift ‚kärd]
(oceanography)
A card, such as is used in a drift bottle, encased in a buoyant, waterproof envelope and released in the same manner as a drift bottle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In August, 400 plywood drift cards stamped with ''This could be oil" were thrown into the Fraser River to demonstrate how far oil might travel if it spilled out of Kinder Morgan's Trans Mountain pipeline, and within 50 minutes the cards had travelled three and a half kilometres downstream.
Will bring tanker talk to the house
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