Not all aircraft have the Nav button but use VOR LOCK instead but it appears to do the same thing.
Myself I am still getting use to my fleet of Airbuses that do not have a course selection gauge. It picks up the appropriate course from the ILS signal. I know it sounds crazy but it works. Whenever i use the show flight path for landing the squares are perfectly aligned with the runway. This is not the case for aircraft that have the course selection gauge if this is not set correctly there is no telling where the path will lead you.
Gary M Buska
SYSTEM Specs ASUS P8Z68 V/GEN 3 mother board: INTELL I7 2600k 3.48 ghz Quad core CPU with Sandy bridge: 12 Gigs of 1800hz ram:
GTX 950 OVER CLOCKED: 2 Gigs Ram Windows 10 Home 64 bit Operating system. 750W Dedicated modular power supply. Two Internal 1TB hard drives 1 External 1TB 3.2 USB hard drive. SAITEK Cessna flight Yoke with throttles.
CH Rudder Peddles 27 inch Wide screen Monitor