I never was a fan of FSNavigator.. I always figured that 1/2 the reason I was sitting in front of a monitor.. simulating being a pilot... was to BE a pilot, and navigate accordingly. If you just monitor your position by moving map (or even the GPS), you aren't navigating at all.. It's much more fun and challenging to find your way around by instrument. MSFS replicates this so well, that when hooked up to approved hardware, and overseen by a CFI, you can actually log up to 10 REAL hours toward your instrument rating.
That aside,, the GPS is a moving map.. and the map function you can bring up by the tool-bar shows you everything you need to know.
There are some freeware substitutes for FSNav, but I can't remember their names.