Glossaries: K9 SAR Glossary
Thermal : Layers of air, separated by temperature (and humidity).
POD (Probability of Detection): The chance that an object or missing person will be detected if present.
POA (Probability of Area): The chance that a missing person (or clue) is in the search Area.
PLS (Point Last Seen): a point where a witness actually saw the subject. The PLS is usually the IPP (Initial Planning Point).