Yesterday, I was out doing a little scouting, sweeping in a few sites. I was running my gain at 25. This one spot I wasn't seeing anything in auto so switched to 27 manual and got a few signals, like whisper high tones, with depth gauge showing 10 inches. I was in a hurry and didn't up the gain to 30. My question is: Is this what I should be hearing on say on a 10" dime with gain at 25? This morning when I was hunting I had my gain on 30 and everything was loud and clear. That's actually the way I normally run, same with etrac.