Sonar detection has failed , sir !

[Molon Labe]

Originally Posted by CapitanPiluso

Not at all



Really don't know...whcih would be the right value?

To go along with the PD theory, another possibility is just that you're listening at PD too long. Sonar performance is degraded above 200ft or so. (Having a mast up also increases self noise.)

Gamma values.... check out the image in TimmyG's TacMan package. If you can see that ****, then you're OK for the 688I, if not, you're not.

I'd also recommend turning the gamma up to something higher than you think you need, testing it on a seawolf's sonar, and then turning it down until you can still see the line but it's not crazy bright. The Seawolf's NB is the one with the most difficult lines. (does anyone have an image of that? I thought Fish posted a test image somewhere but I wasn't able to find it.)