My bow unit will not display the depth on my screen overlay. It just shows 3 dashes where it should be. It tracks the bottom just fine and auto ranges as it should. I have a 3n1 ducer on the ghost and it is showing the correct ducer when I check settings. Any ideas? When I use a split screen display with side scan it will show the depth on the sonar page but I’m guessing it’s getting the reading from the 3n1.