rservice wrote on Mar 13^th, 2012 at 1:03am:

I think there is some basic instruction in the MS FSX help area on basic navigation,which is what you must learn to fly this model. It is a 60's vintage aircraft and did not have FMS or GPS. That is, it is trying to replicate the aircraft as it was,so you need to learn hand flying techniques to a much greater extent than a 737NGX for example. Ron

You might already know this, but it's the Boeing 737NG.  "NGX" is the name of a specific company's product, with the "X" meaning it is the FSX version.