visual slope aid

abbreviated visual approach slope indicator system (avasis)

visual approach slope indicator system (vasis)

navigational aid (NAVAIDs); aid to navigation (ATON)

junction aid (obstruction aid)

obstruction aid (junction aid)

visual aid

beyond visual range / beyond-visual-range (BVR)

continuously variable slope delta (CVSD)

forward slope

front slope

rear slope

reverse slope

reverse slope defense

slope distance

steep slope

glacis slope

forward side slope ground clearance

max side slope

side-long slope

centering slope

compression slope

forcing slope

runway slope

adjusted slope of sound pressure level

windward slope

change in slope of sound pressure level

noy slope

slope of sound pressure level

average slope of sound pressure level

glide slope (GS)

glide slope antenna

glide slope beacon