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Originally Posted by Frame57
The fathometer is what is used to hopefully make sure one does not run aground. HF sonar is used for navigational purposes. Go ICEX 79!
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How close you are, but there is more than one fathometer on board. The nav techs also had a HF fathometer and if the SINS system didn't agree with the reading of the fathometer the alarms would go off.
Seems the whole Med had been mapped underwater from the numerous travels of other submarines and perhaps a lot more than just the Med by now.
Remember this was 37 years ago ... I haven't been on a modern boat and I doubt if they would explain it to me anyway.
Yes, sonar can be used to navigate, but we sure did hate the surface craft navies using it on us.