Distance determination via sonic logging
If the distance of the path traveled is to be determined, then it is necessary to know precisely with what velocity the pulse traveled through the medium. The majority of sonar systems in use worldwide contain no means for determining the acoustic velocity. Instead, the velocity is estimated from tables and from experience. For instance in brine caverns, in which the acoustic velocity lies between 1740 m/s and 1870 m/s depending on the density, the velocity is assumed to be 1800 m/s. The maximum distance error in the radius is proportional to the inaccuracy of the acoustic velocity (-60 m/s to +70 m/s), which corresponds to an error of -3.33% to +3.88%.

socon grundlagen laufmessung