Welcome to the forum.
You need to adjust your SI range. A good rule of thumb would be to have it set to 3 to 4 your depth. So in 60' of water, you would probably want to set it to around 180' per side.
Depending on what you are looking for, your range will vary with depth. Larger targets like shipwrecks will allow you to set a much larger range say up to 240'. If you are looking for fish, a shorter range is better since they will be much harder to see. This is where the 3 to 4 times your depth comes in. So in 20' of water, say 60 to 80' range.
Hope that helps.
Robert