.
.
.
.
.
.
"SDN:P01::TRTM2WAY" .
"TravTime2-way" .
"Two-way travel time of sound in the water body by echo sounder"@en .
"accepted"@en .
"Time taken for an acoustic signal to travel from transmitter to reflector and then back to a receiver co-located with the transmitter"@en .
.
.
.
.
.
.
.