Instructions
It is important that if you have instructions available for your depth finder that you read them. Most depth finders features and menus vary greatly by manufacturer.
Transducer
Make sure your transducer is properly mounted, and is aligned vertically at the right depth. If a transducer becomes misaligned or partially out of the water, it will greatly affect the accuracy.
Mode
Depth finders most often come with an automatic or manual setting mode. The automatic mode is recommended for beginners as it will be set to work properly from the start. The automatic setting menu will let you easily turn on and off select features. The manual mode allows you to fine tune certain areas of the depth finder. This is only recommended for anglers who have a lot of experience with their electronics.
Graph Scale
Depth finders display sizes vary by the amount of pixels. Depending on the size of the graph, the relationship between depth and size on the screen can vary widely among models. It is recommended that you practice with the depth finder, getting use to the scale of depth on the screen. This can be achieved by traveling over varying depths and structures.
Sensitivity
Changing the sensitivity of your unit will greatly increase the accuracy when there are weeds present. You can lessen the sensitivity to find the true bottom when there is a mass of weeds. You can also turn up the sensitivity to find structure in deep water. You will have to practice with the sensitivity over known structures and weeds to set your unit properly.