I have an LNav connected to a Model 20 GPS. The LNav has all the latest
updates.

The Vario that is part of the LNav system shows about 1 kt up when sitting
still. When the system is turned off, the vario settles back to zero. I
have a Winter mechanical and it shows zero while this one shows up.

Where can I adjust it to get to show zero right after start up?

Thanks,
Fred