Bought a new Element this Spring. Had it out 5 times .Really easy to operate from one screen to the next. Like it a lot but to my knowledge I haven't marked a fish on it yet. Sure seems like I should have . On down vision I've seen a few white spots but they are very,very small. Do I have my setting wrong ? I have it on "automatic" -- Running it usually 10 to 20 feet in depth . Any suggestions ? Thanks