'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.
Not enough to provide steerage way, so as with the parachute sea anchor, you may wish to go below and sit it out. Owing to the amount of labour involved, buy one of these already made up may seem a little expensive - until you need to use it that is.