I just started flying an ASW-19b at our club that has an L-Nav, GPS-NAV, Vario combo installed. When I turn the unit on, I get the barro page. I can set the altimeter here but the Go button does nothing. So I can't get to the main screen. Yesterday I gave up, left the L-Nav on. About 3 or 4 minutes later (on tow), the main screen came up on it's own.

Am I doing something wrong? I RTFM, but am guessing the Go button is flaky and maybe the barro page times out after a few minutes. Everything else works once I get to the main menu.