Seeker ... you'd probably get better screenshots (clearer & more defined images) if you were moving a little faster. Your SI sonar beam is like my DI sonar beam ... when moving slow it stretches out the image because the beam is constantly hitting the same object over a longer period of time, so instead of showing a single small object ... it keeps reflecting the signal from that object and makes it look like it's bigger/longer than it really is, or draws a straight line.
This is how my E5DSI unit screen shows things when I'm not moving :
... cp