UXOs exist in regions that have encountered substantial bombing during past wars, such as Europe, Asia and the US.
UXOs deteriorate over time making them more sensitive and more likely to explode if disturbed.
UXOs prevent civil land use, are a danger to public safety and are a significant environmental concern.
Locating UXO prior to excavation is required to prevent serious consequences.
Geophysical noise - Ferrous objects in made ground, ferrous geological materials, surface structures and infrastructure and variations in the Earth’s magnetic field
Ground obstructions - reworded to Magnetic contamination - eletronics, power lines, man made magnetic fields - some could apply to GPR as well