I have been reading about different types of underwater navigation. According to this Youtube video, these are the following navigation systems:
- Inertial navigation systems (use of Inertial Measurement Unit)
- Acoustic (e.g., long-baseline)
- Geophysical (use of external environment information)
This article states sonar affects whales and the use of the acoustic navigational systems should be minimized. It seems like the combination of inertial and geophysical underwater navigation is not enough. So what kind of underwater navigation system one should use in order to be environmentally friendly but also accurate?