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倒置回声测深仪（ＩＥＳ’Ｓ）是用来测量ＩＥＳ到海表面环行声学传播时间。推荐这些相当廉价的海底安装的仪器是为了以下几个目的：ａ．长期监测特殊站点的动力变化（如热容量、温跃层、动力高度偏差等）；ｂ．卫星高度计的公海校准；ｃ．研究近岸验潮仪和近海验潮仪之间不同的海平面信号。为测量海平面的变化，特别是厘米级精确度的变化，必须获得传输时间和动态高度偏差之间的精确关系。假设在动态高度偏差和传播时间之间有不变的线性回归系数，根据１９８４－１９８７年期间巴哈马的阿巴科岛外，深度范围０～３０００ｍ，７７个采样测量结果，发现传播时间和动力高度之间的回归系数的变化是系统地、逐月地变化。如果不用计算的话，在把ＩＥＳ的测量数据应用到海平面变化时，该回归系数可以加±１０个动态厘米级的辅助误差。
Inverted echo sounder (IES’S) is used to measure the IES to the sea surface acoustic propagation time. These relatively inexpensive subsea installations are recommended for the following purposes: a. Long-term monitoring of special site dynamic changes (such as heat capacity, thermocline, power height deviation, etc.); b. High altitude satellite altimeter calibration; c. Study different sea level signals between near-shore tide gauges and near-shore tide gauges. To measure changes in sea level, especially centimeter-level accuracy, the exact relationship between transmission time and dynamic altitude deviation must be obtained. Assuming a constant linear regression coefficient between dynamic altitude deviations and propagation times, based on 77 sampling measurements from depths 0-3000 m, outside Abaj Island, The Bahamas, 1984-1987, it was found that propagation time and power altitude The regression coefficient between the changes is systematically, month by month changes. The regression coefficient adds up to 10 dynamic centimeter-level ancillary errors when applying IES measurements to sea-level changes, without calculation.