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The nominal value for speed of sound in seawater is nominally
http://www.chacha.com/question/what-are-the-measur...
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Adjusted ultrasonic age
http://wiki.answers.com/Q/What_does_the_measuremen...
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an ultrasound wave is beamed down from a boat and then the wave bounces back from the seabed to a reciever. the longer the wave takes, the deeper the water.
http://wiki.answers.com/Q/How_can_Ultrasound_be_us...
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There 80% accurate no one knows what size ur baby will be.
http://answers.yahoo.com/question/index?qid=201304...
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