оптична розвідка
flash-ranging (location), flash-spotting
flash-spotting observation post
flash-spotting post
flash-spotting section
flash to bang / flash-to-bang (time)
mine spotting
spotting and reconnaissance aviation
spotting points
deviation spotting
bilateral spotting, horizontal base method
reconnaissance spotting helicopter
bilateral spotting
vertical spotting
flank spotting
aerial spotting operation
aerial spotting
axial observation spotting
magnitude spotting
target spotting mission
target-spotting mission
target-spotting prediction plate
single-station spotting
spotting aircraft
spotting area
spotting board
spotting bottle
spotting charge
spotting correction
spotting detail
spotting observation
spotting observer
spotting officer