An ocean current is a continuous, directed movement of seawater generated by forces acting upon this mean flow, such as breaking waves, wind, the Coriolis effect, cabbeling, temperature and salinity differences, while tides are caused by the gravitational pull of the Sun and Moon.
RDDs - Radar Detector Detectors, All Acronyms, viewed April 15, 2017, <https://www.allacronyms.com/RDDS/Radar_Detector_Detectors>.
TDD is an abbreviation for telecommunications device for the deaf. It is an electronic device that was invented to make it easier for people who have hearing or speaking disabilities. In some instances, the TDD is also referred to as TTY, which can stand for typewriter or teletypewriter. Description The modern-day TDD is designed as a sort of mini-computer, consisting of a keyboard and an LED or LCD screen to display the electronic text being typed.