A bit of clarification: What it does is show what direction the aircraft is travelling in right now
. There is no prediction and no time span involved.
Bit of nifty and useful fighter technology making its way into airliner cockpits. You can get a lot of information which is useful on the approach from the FPV, apart from the obvious issue of where you are going to impact the runway (impact, as the provision for actually hitting that spot is not flaring). The difference between the FPV and the fuselage reference gives you the AoA, and the position of the FPV on the pitch ladder is the glide path angle.
Put the FPV in the right place for the correct AoA (no need to worry about tabulated approach speeds any more; some fighters provide on-HUD brackets for the approach AoA), one the desired GPA on the pitch ladder and on the aimpoint on the runway and you are good. Just keep it there until the flare and you have a landing. Of course, some aircraft enables you to ignore the roundout as well, and even to keep the brakes full on even before impact...
I thought I was doing good trying to avoid those airport hotels... and look at me now.