It is a flight-computer and a metric vario. The flight computer operates
without a GPS. Here is an article on this instrument:

http://www.gliding-in-melbourne.org/news/ps910101.htm



"ContestID67" wrote in message
...
I'll bite, what is a Zander SR820? A little research on the web
didn't turn up much. Do you have a link to the company's web site?