Re: Weak Sonar Image
Auto sensitivity will adjust as depth and conditions change. If you want to adjust the sensitivity yourself be sure to disable the auto sensitivity. To do this hit menu twice, go to sonar and hit enter, go down to auto sensitivity and hit enter. Then go up to Adjust and make your manual adjustments to the sensitivity. If you adjust the sensitivity up while the auto sensitivity is checked, then you are adding more sensitivity to the auto adjustments the unit is making. This is way too much and the screen will be almost completely blocked out.
As for the signal image itself there are a couple things you need to do with the HDS units concerning the transducer and fishing mode settings. First while in a sonar screen hit menu twice, go to sonar and hit enter. Go down to Fishing Mode and hit enter. Choose Shallow Water if you do most of your fishing in less than 100 feet and hit enter. Now go down to the bottom of this screen where it says Installation and hit enter. Go to the bottom of the next screen to Transducer Type. It will say "Unknown". Go down to this box and hit enter. The list of available transducers will come up. Look on the cable of your transducer where it plugs into the unit and find the chrome tag. On this tag will be the model number of your transducer. Find that number on the list, highlight it and hit enter. This will replace Unknown with the model number of your transducer, hit enter. Be sure to Save your changes.
This will help the unit find the bottom and keep the lock as you fish. It could be that the HDS unit simply has more power and the old ducer just won't display the image the HDS unit is trying to show. The new transducer is the next step to fix this issue.