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在近海石油勘探中，一般要求钻井船的转盘相对于海底井口的位置偏差不超过工作水深的5％，相当于要求钻具从船上进入井口的垂直倾角不大于3°，以不影响钻井作业及损坏钻具。为了监视钻井船与海底井口的相对位置，我们与有关单位协作先后研制了Ⅰ型和Ⅱ型二种超声波船位仪。此仪器除用于近海石油钻井船外，还可以供动力定位船作船位检测用，可用于打捞船监视船位。稍加改进还可用于搜索寻找海底固定目标，以及在一定范围内跟踪水下活动目标用。
In offshore oil exploration, it is generally required that the position deviation of the turntable of the drilling vessel relative to the subsea wellhead does not exceed 5% of the working water depth, which corresponds to a requirement that the vertical inclination of the drilling tool from the ship into the wellhead be not greater than 3 ° so as not to affect drilling operations and Damage to the drill. In order to monitor the relative position of the drilling vessel and the subsea wellhead, we have developed two types of ultrasonic position gauges, type I and type II, in collaboration with the relevant units. In addition to this instrument used in offshore oil drilling vessels, but also for power positioning ship for the detection of the ship can be used to salvage the ship to monitor the ship. Slight improvements can also be used for search to find fixed targets on the seabed, and to track underwater activities within a certain target.