спостереження висоти розривів
instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)
mine spotting
spotting and reconnaissance aviation
spotting points
deviation spotting
bilateral spotting, horizontal base method
flash-ranging (location), flash-spotting
reconnaissance spotting helicopter
bilateral spotting
flank spotting
flash-spotting observation post
flash-spotting post
flash-spotting section
aerial spotting operation
aerial spotting
axial observation spotting
magnitude spotting
target spotting mission
target-spotting mission
target-spotting prediction plate
flash spotting
single-station spotting
spotting aircraft
spotting area
spotting board
spotting bottle
spotting charge
spotting correction
spotting detail
spotting observation
spotting observer
spotting officer