Geophysical Acquisition Role roleType extRoleType refinedRoleType refinedExtRoleType POSC 1.0 client The business associate for whom the work is being done. primary contractor The contractor who is responsible for the overall acquisition project. acquisition contractor The contractor who is responsible for the acquisition of the basic geophysical data. positioning contractor The contractor who is responsible for the collection of the basic navigation or positioning or location data. naviagation processor The business associate who determines the appropriate locations based on the basic navigation data. recording crew The group that performs the field work of recording the basic geophysical data. file quality control final coordinate approval provisional coordinate approval shooter The business associate responsible for setting off the source events. driller The business associate responsible for emplacing the sources in drill holes. observer The person in charge of recording on a seismic crew, and often the field manager. surveyor The business associate in charge of placing source and receiver stations, and determining their locations.