Hi,
737NG is sold as a "full airliner simulation" and as such is the only add-on where you can truly say that it operates 99% the same as the REAL plane.
It is incredibly complex, as you're no doubt finding out, and it took me around 3 months of study and practice to be able to operate all aspects of the Aircraft - a lot of people give up on it, and REALLY lose out !
Let me answer the Question about the GPS first... in reality, Airliners don't have simplified GPS systems like the FS9 default one, with a simple link to the Autopilot. The NG like most Airliners has a FMC which manages all aspects of flight.... so you need to read the manual for the FMC pretty much before you do anything. When you able to programme a route in it, and set up the Vertical Navigation settings (altitudes and speeds) you'll be able to use the LNAV and VNAV modes on the Autopilot, and the automation is amazing - your plane will climb, accelerate, descend, decellerate all on it's own, it's very clever stuff. So in short, no default GPS screen but that's not what this add-on is about - it's about full realism.
STARTING THE ENGINES MANUALLY :-
- Ensure the battery is switched on (towards top of overhead panel).
- Press APU START (towards bottom of Overhead Panel).
- Open the Throttle screen and make sure the fuel switches are set to CUT OFF.
- Switch "APU BLEED" ON... (Top right of Overhead Panel).
- Swtich Ignition Selector to RIGHT (Bottom middle of Overhead panel).
- Switch 'Right' Igntition switch to GROUND. (Bottom middle of Overhead panel).
*** close the Overhead panel for now, as the Starters will now be running on Engine 2 ***
- Look at the N2 dial in the ECAM (Engine Data) displal on the Panel.... When the dial reaches 19%, open up the THROTTLE page and switch the RIGHT ENGINE FUEL switch from Cut-off to ON.
- The RIGHT engine will roar into life and the N1 monitor will spool up to 23%.
*** The RIGHT engine is now running ****
- Open the Overhead panel and switch the Ignition selector from Right to LEFT.
- Move the 'Left' Engine Ignition switch to GROUND. (Bottom middle of Overhead Panel).
- Close the Overhead Panel and monitor the Right Engine N2 rate until it reaches 19%.... then open the THROTTLE screen and swtich the Right Engine Cut-off switch ON....
*** The Right Engine will now be runnung ***
- Open the Overhead Panel and turn the APU OFF. (Bottom of Overhead Panel).
- Click the GEN1 and GEN2 buttons ON to turn on the main Generators (Bottom middle of the Overhead Panel).
- Turn the Yaw Dampers ON (Top Left of Overhead Panel).
- Click on the YELLOW WARNING light on the Left of the main Panel.
Now as for whether all the buttons work, well if you forget to do any of the above steps, the engines will not start ! Try starting an engine without switching APU BLEED on for example and see what happens...
Good luck.