berth. We have an apelco fish finder/depth sounder. The depth alarm is set for 6 feet. Around the northern end of Garrett Island the water is about 50 feet or a little more. suddenly the depth alarm was screamin and showing 2.8 feet. A few seconds later it started givng us fish alerts. we had run across a very large shoal of either Hickory Shad or Rock Fish. The screen was covered with icons. No I didn't drop a hook. ;( no license yet ;( and we were heading for home. if we were going to spend the night out I would have trolled a lure thru there and had fish for supper. 