How Things Work on Instagram: "An ILS approach for a helicopter works the same way it does for airplanes: the helicopter’s instruments lock onto two radio signals—localizer for left-right alignment and glideslope for vertical descent—and the pilot follows those signals down to the runway or helipad. The helicopter’s flight computer and navigation displays show deviation bars that tell the pilot if they are left/right or above/below the correct approach path. Because helicopters can fly slower an