Object in sky that was stationary, then gone completely

We were fishing (trolling and heading south along the west shoreline when I spotted what I figured was a plane, but it was stationary and did not move. I watched for a bit, then asked my husband if that was a plane. He looked up, said, not sure, there are binoculars in the compartment, take them out and see.
I retrieved the binoculars and looked up and saw a blurry shape with multiple edges, like distinct extended shapes from the top, bottom, right and left. But because it was blurry, I looked down at the binoculars to adjust the focus, looked up again, and it was gone.
We both noticed it gone, and came across a man with his son or grandson on the dock fishing as we were passing by. We asked them if they saw the UFO, jokingly. The man said yes, but nothing else. The child did not say anything.
We continued on our way, with me glancing toward the sky the rest of the evening, but no more sightings of anything.
Later, my husband said he thought it was cannister shaped with his naked eye.
It was a clear evening, no clouds.