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derrinurban · 05-05-11, 05:38 PM

I do much the same as osmium steele, except for some minor differences.

I make all my sonar sweeps during partols from a depth of about 25m. I have found it to be more reliable. I can click 25m depth on the dial easily and do not have to worry about missing any contacts. In some stormy/bad weather situations, at periscope depth, I just about missed some contacts because the hydrophone would only work sporadically. My depth was varying to the point that at times I was above the depth where hydrophones activate, giving me a dead spot in the sweep (hope that makes sense).

Once I first hear a contact, I surface and head straight for him, at standard or full. After running on surface for 15-20 mins., I submerge and listen again. I now take note of which side of 000 the contact is at now. This tells me the rough direction he is heading.

Slightly left/right - target is either slow moving or moving at a sharp angle to my present course (still not sure at this time if it towards me or away from me)
Significantly left/right - target course is closer to perpendicular to my course.

This information helps you to determine how to adjust your course to intercept the target. A few more rounds of surface and submerge and even Bernard should be able to hear him.

05-05-11, 05:38 PM	#7
derrinurban Mate Join Date: Aug 2009 Location: Calgary, Alberta, Canada Posts: 54 Downloads: 33 Uploads: 0	I do much the same as osmium steele, except for some minor differences. I make all my sonar sweeps during partols from a depth of about 25m. I have found it to be more reliable. I can click 25m depth on the dial easily and do not have to worry about missing any contacts. In some stormy/bad weather situations, at periscope depth, I just about missed some contacts because the hydrophone would only work sporadically. My depth was varying to the point that at times I was above the depth where hydrophones activate, giving me a dead spot in the sweep (hope that makes sense). Once I first hear a contact, I surface and head straight for him, at standard or full. After running on surface for 15-20 mins., I submerge and listen again. I now take note of which side of 000 the contact is at now. This tells me the rough direction he is heading. Slightly left/right - target is either slow moving or moving at a sharp angle to my present course (still not sure at this time if it towards me or away from me) Significantly left/right - target course is closer to perpendicular to my course. This information helps you to determine how to adjust your course to intercept the target. A few more rounds of surface and submerge and even Bernard should be able to hear him.