I've recently installed an Eagle FishElite 480 on my boat, the transducer is mounted on the transome as per the norm. It's a 1500 wat peek to peek unit with a 20 degree cone angle so coverage is 1/3rd of depth, a 6 foot circle in 18 feet of water for example.

I get all of this, but here's where I need some help.

When I'm looking at the sonar display on the 5 inch screen in 18 feet of water (for example) what I'm seeing, because of the 6 foot cone, is 3 feet in front of the transducer and 3 feet behind it (let's skip the side to side to make this easier on me), but what I don't get yet is where is the centerline of the display?

What makes sence to me is that the tranducer's location is at the top of the screen and right in the middle, so I'm seeing 3 feet in front of it and 3 feet behind it on the 5 inch screen. Seems right, if it's a 6 foot cone, then I'm seeing everything passing through that cone and the referrence point is the top center of the display.

Is this correct or am I missing something??