While surfing through the www. I found this:
https://www.sued-west.com/Ausruestun...PSmap-66s.html
The link is dead now.
http://webcache.googleusercontent.com/search?q=cache:-0PCiVqZnzYJ:https://www.sued-west.com/Ausruestung/Outdoor-Technik/Navigation/Garmin-GPSmap-66s.html%2BGarmin+GPSmap+66s&client=opera&hs=Cxb&channel=suggest&gbv=1&hl=de&ct=clnk