Operation Manual
Page 20
... should only be used by advanced sonar users. As a result, water depth readings do not account for the distance from the transducer to the keel or from the transducer to continue smooth scrolling if the bottom depth is in manual mode, you may not receive any depth readings, or ...monitor the effects noise (boat pumps, water conditions, engine ignitiion systems, etc.) has on your display, and then filters out the undesired signals. Manual Mode Restricts digital depth capability, so the unit will only send sonar signals to the water surface. That allows the display to the bottom. ...
... should only be used by advanced sonar users. As a result, water depth readings do not account for the distance from the transducer to the keel or from the transducer to continue smooth scrolling if the bottom depth is in manual mode, you may not receive any depth readings, or ...monitor the effects noise (boat pumps, water conditions, engine ignitiion systems, etc.) has on your display, and then filters out the undesired signals. Manual Mode Restricts digital depth capability, so the unit will only send sonar signals to the water surface. That allows the display to the bottom. ...