Secretary of the society Dominic McNamara said a number of Central Coast residents reported seeing yellow, spherical objects in the skies around Gosford.

"One man said he saw a spherical object he couldn't logically explain," Mr McNamara said.

"He reported seeing it rise from out of the water, hover in mid-air and then speed off. He couldn't explain how it had come out of the water but he said the craft did have an effect on the water and seemed to produce a curtain of water between it and the sea."

Locals also reported seeing an object fitting the description of a UFO reported at Long Reef, Mr McNamara said.