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pythos · 03-02-10, 01:39 AM

The instrument you referre to I believe is called the echolot (sp). It is an device that is operated by THE NAVIGATOR, not the hydrophone operator.

On the boat it is located above the navigator's position and looks like a black dial with a white concentric ring.

The device was like a small active sonar set, but pointed down. There was no head set like the ones found on the hydrophone set. Instead the instrument fired a ping straight down, and measure the amount of time it took for a return. Then a pointer in the circle would orient itself to the determined depth under keel.

All U-boats had this.

Key point, it was used by the navigator, not the sound man.

03-02-10, 01:39 AM	#11
pythos Grey Wolf Join Date: May 2005 Location: Somewhere over there Posts: 834 Downloads: 46 Uploads: 0	The instrument you referre to I believe is called the echolot (sp). It is an device that is operated by THE NAVIGATOR, not the hydrophone operator. On the boat it is located above the navigator's position and looks like a black dial with a white concentric ring. The device was like a small active sonar set, but pointed down. There was no head set like the ones found on the hydrophone set. Instead the instrument fired a ping straight down, and measure the amount of time it took for a return. Then a pointer in the circle would orient itself to the determined depth under keel. All U-boats had this. Key point, it was used by the navigator, not the sound man.