Mr. Caveman,
Hit the eLibrary link on the TravellerRPG banner, it's just to the right of the CotI link. Look on the left hand margin of the new page. Under 'Official Downloads', you'll notice the word 'Maps'. Give it a try.
All four sectors are available there; for free. They are tucked into zipped and are formatted as PDFs. If you don't have the free Adobe PDF Reader yet, there's a link for that too, or you can google 'Adobe PDF Reader'.
Sincerely,
Larsen