звукометрична станція (спостереження)
sound ranging (artillery sound ranging)
sound-ranging advanced post
sound-ranging post
observation point / observation post (OP)
sonar (sound navigation and ranging)
aerial sound ranging
air registration point (in sound ranging)
sound-ranging adjustment
command-and-observation post
artillery observation post
control observation post
air observation post observer
amount of command of observation post
antiaircraft observation post
battery observation post
cross-observation post
flash-spotting observation post
fort-observation post
forward observation post
forward observation post observer
groupment observation post
armored observation post
artillery group observation post
artillery groupment observation post
artillery observation post vehicle
forward artillery observation post
mobile artillery observation post
vehicle-mounted artillery observation post
air observation post
air observation post flight
air observation post squadron
command p.-observation post