I am considering buying a BlueChart Americas CD to load data into my Garmin GPS Map76 (handheld, grayscale). I see Ver. 7 available (with one unlock code) periodically on eBay for $50 - $60 in new sealed packages. I see Ver 8 for $100 - $120 or so. Is it worth the extra $50 or so dollars for the Ver. 8 considering my GPS unit? Is it worth it to add Bluechart period? I plan to cruise in Eastern Long Island sound. Thoughts?