TuneVNAV Descent v1.3 is an improved FMC like software that calculates the optimum descent and approach speeds of an airplane. Now the TuneVNAV's v1.3 computed speeds are 80% identical with the plane's FMC's speeds and 20% better!
Adjust your FMC speeds with TuneVNAV's computed speeds, and you'll be able to land LNAV/VNAV connected.
Check tutorial demo videos to see TuneVNAV's results. Register with TuneVNAV and get access to "Ready to Fly" Tutorial Flight Projects.
For more info and demo tutorials go to:
www.tunevnav.com