Perceived centre mass of object
Image 4. The searcher is only able to establish the signal at the centre of this pressure plate
Start of excavation
Image 5. This image shows that by having a set minimum distance (x + y) the excavation will start from a safe position
EXCAVATION DISTANCES REFERENCE FOR IMAGE 5 AND IMAGE 6
X
Assessed worst-case distance from suspect signal to the end of a component
Y
Additional distance to ensure excavation in a safe area
X+Y
Distance from pinpoint to start of excavation
A
The depth of excavation
Search core skills and procedures
198
Powered by FlippingBook