Visual Approach option on FMC
777 FMC'S have an option for a visual final along with the option of a pilot specified RW EXTENSION of upto 25 nm. The FMC then provides a path with a nominal 3 degree GlidePath angle working back from 50ft over the threshold. Alternatively the GlidePath angle can be set within a range of between approx 2.5 to 3.4 degrees.