It has its own propulsion, it is a semi-submersible oil drilling type platform. It is coming here for upgrades to it propulsion system. It is another Boeing product. I worked on the Sea Launch system for Boeing which also uses a similar oil drilling type platform, but used for launching commercial type satellites.

You can track the progress of SBX 1 by going to clicky here
currently approaching Port Angeles


Edited by Excitable Bob (05/10/11 11:29 AM)
_________________________
She sits on the dock a fishin' in the water uh, huh
I don't know her name she's the fisherman's daughter uh, huh
Come on down to my boat baby
Come on down where we can play
Come on down to my boat baby
Come on down we'll sail away.