Things have changed with the autopilot. There is no longer a nav button. Now there are three. VNAV LNAV APPR. I’m a bit confused.
NAV is now LNAV with the same functionality 😉
Glad I could help.
LNAV- your old NAV just with a weird name.
VNAV- Vertical Nav helps you descend.
APPR- helps you with your landing stage when in the approach cone!
LNAV stands for lateral navigation.