OceanGate's Titan submersible carries a state-of-the-art self-contained inertial navigation system which it combines with an acoustic sensor known as a Doppler Velocity Log to estimate the depth and speed of the vehicle relative to the sea floor.

海洋之门公司泰坦潜携带了最先立惯性导航系统，它结合了一个被称为普勒速度日志声学传感，以估计潜对于海底深度和速度。

If these were impractical for a particular target was an exquisite piece of technology called an inertial navigation system.

如果这些对于特定目标不切实际话，那就有一种被称为惯性导航系统精妙技术。