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This uses the 48-term density equation.
gsw_sound_speed(SA, CT, p)
Absolute Salinity [ g/kg ]
Conservative Temperature [ deg C ]
sea pressure [ dbar ]
sound speed [ m/s ]
http://www.teos-10.org/pubs/gsw/html/gsw_sound_speed.html
gsw_sound_speed_t_exact for a precise formula using in-situ temperature
gsw_sound_speed_t_exact
# NOT RUN { gsw_sound_speed(34.7118, 28.7856, 10) # 1542.420534932182 # }
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