Editing Remotely operated underwater vehicle (section)

==Tether management==
ROVs require a tether, or an umbilical, (unlike an AUV) in order to transmit power and data between the vehicle and the surface. The size and weight of the tether should be considered: too large of a tether will adversely affect the drag of the vehicle, and too small may not be robust enough for lifting requirements during launch and recovery.

The tether is typically spooled onto a tether management system (TMS) which helps manage the tether so that it does not become tangled or knotted. In some situations it can be used as a winch to lower or recover the vehicle.<ref>{{Cite book |last=Bai |first=Yong |title=Subsea Engineering Handbook |date=2019 |publisher=Elsevier Science |isbn=978-0-12-812622-6 |edition=Second}}</ref>