Airstrip converted by Elisa are able to gives across paint marks a stabilized approach assistance by means of a single light source from a position adjacent to the intended touchdown point.

ELISA C16 and C18 protocols has an effective visual range of 20 nm at night. A pilot who is flying the approach on glidepath will see a steady white light. If he should stray above glidepath, he will see a pulsing blue light. Alternatively, if the pilot begins to descend below glidepath, he will first see a flashing red airstrip the lower he goes.