On a sailing trip across Lake Ponchartrain we spotted the craft having above land

I was around 10-12 years old. My dad had a sailboat in New Orleans marina. Sometimes we would take trips to cat island. We normally would take one day to cross the lake to lacombe to anchor for the night. Then we spend part of a day going to the rigolets and then another day sailing to cat island. One one trip, it was about 6pm when I noticed something on the horizon. We were a few miles off the coast. My dad had binoculars, so we all got a chance to see it. It was like a football in shape. It was chrome or steel in appearance. No seams to be seen. No noise or lights, but it was only 100-300 ft off the ground so we couldn’t see the underside. I noticed while looking through the binoculars that the craft seems very defined, as if there was a black line drawn around it. That’s the only way I can describe it. It seemed almost as if it was a mirror finish, but hard to tell because the sky was clear. It seemed to sit there 30 min. After 15 min we kinda got bored looking at it, and weren’t watching it constantly. Eventually it just disappeared. Not like it flew off. Disappeared. We really didn’t talk about it. At the time I didn’t believe in aliens because finding out the tooth fairy and Santa don’t exist, you think everything is a fairytale. I kinda forgot about this…I could never just tell someone without them thinking I was crazy. But it happened. Unfortunately my dad and his friend that was there are no longer here to discuss it with me.