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.
References in periodicals archive ?
Last October, a drift card, dropped along an oil tanker route that runs from Burrard Inlet at Vancouver as part of similar exercise, was picked up in Haida Gwaii, more than 1,000 km from where it was dropped.
The new TowerGroup report titled, "Gift Cards: How to Ensure they Don't become Drift Cards," segments the consumer vulnerabilities into three groups: consumer, merchant and fraud.