non existant island

there is an island shown here:

Which I am 99% sure does not exist; it is source = landsat – which as far as i know means it’s likelly an error.

Is there any way to check this for sure?

GoogleMaps and Yahoo have high resolution images for this location but there is only water, no island. Only MSLiveMaps shows a white dot, labeled “The Outer Islands” (, but if zoom out 1 level the label moves to the southern edge of the Shetland Mainland. So I guess that this is a cloude and therfor can be removed.