I was fishing in a boat with a friend late at night on high lake near boulder junction, wisconsin. around 2-3 am, my buddy pointed out a light in the sky which to my memory was moving from west to east. at first i thought it was a satellite as the movement was smooth and completely silent. soon, however, the object began to zigzag making random abrupt directional changes while still moving generally in an eastern direction. the light was the size of a star and my feeling at the time was that it's altitude was quite high however i have no proof of that. i even shined my flashlight at it but my friend told me it would not be advisable to signal it in any way. we lost sight of the object when it disappeared over the horizon. i ran into my friend a few weeks ago and asked if he still remembered the incident which he did.