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.
Drift card times were calculated through the difference between the date and hour of release and the date and hour of recovery.
Drift cards trajectory released at Banco Chinchorro, Quintana Roo