Hey Sid,
I've got the smaller ds500x...its a real good thing, they really are quite easy to find your way around...The pop up menus help you navigate around...and the quit button always brings you back to the main page...I don't have a manual but you may be able to look at or photo copy one from your nearest dealer. I know Sundown Marine have the Raymarine units and really look after Ausfishers...If you're on the Sth Side, I'd be happy to help...good excuse to share a beer!!!
Cheers
Rhys