'MUA', All Acronyms, 13 January 2018, <http://www.allacronyms.com/_Medical/MUA/Medical> [accessed 13 January 2018] Bluebook All Acronyms, MUA (Jan. 13, 2018, 7:01 PM), available at http://www.allacronyms.com/_Medical/MUA/Medical. CSE All Acronyms. MUA [Internet]; January 13, 2018 [cited 2018 JAN 13]. Available from: http://www.allacronyms.com/_Medical/MUA/Medical.
A sea anchor is deployed off the bow and a drogue is deployed off the stern. The sea anchor keeps the bow up to weather, a drogue is usually smaller, and allows you to move downwind while acting as a brake. Each has wide variations in the sizes used, and this affects their specific role in sea survival.
Anchors work in 2 ways, either they are massive and use their weight to keep the boat from drifting, OR as in most modern sailing yacht anchors types, they are relatively lightweight and bury themselves in the bottom to stop the boat from moving. Some anchors are now being made of aluminium and rely almost entirely on their shape for their function.