I was on my north-facing patio at about 11:40 pm on 8/19/18, facing east. this is about .5 mile from the atlantic ocean. i heard a sound unlike a helicopter, prop plane, jet or blimp (i know that all, living 2 mi.From an air force base and a public airport). there was some sort of propulsion sound, but unfamiliar to me. upon looking to the ne, i saw a double set of bright lights approaching in a southerly path, approximately a short distance offshore. the lights formed a football shape and may all have been aimed at the water. they were as bright as strobes, but not flashing, just steady on. it slowly cruised off to the south and disappeared behind some tall shoreline buildings.