drogue(n = noun.artifact) sea anchor - restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind;
drogue, n.
1 Naut. a a buoy at the end of a harpoon line. b a sea anchor.
2 Aeron. a truncated cone of fabric used as a brake, a target for gunnery, a wind-sock, etc.