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APC
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Advanced Piston Corer
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A coring tool
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APCT
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Advanced Piston Corer Temperature tool
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An APC coring shoe with termistors for making temperature measurements
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BCR
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Bi-centered reamer
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A bit used to open holes to a larger diameter than the bit diameter
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BHA
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Bottom-hole assembly
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The bit, the thick-wall joints of pipe, and other parts that are at the bottom of the drill string
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CADA
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Cam-actuated drill ahead
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A casing running tool made by Drill Quip
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DDI
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Downhole Designs, Incorporated
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A company
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DP
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Dynamic positioning
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A shipboard navigation system
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EOP
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End of pipe
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The end of the pipe
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FMS
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Formation MicroScanner
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A logging tool
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gpm
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Gallons per minute
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A circulation rate for fluids out the end of the drill pipe
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GPS
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Global Positioning System
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A satellite navigation system
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GUATB-03C
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Guatemalan Basin site selected for drilling
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Now known as Site 1256
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LGH
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Lower guide horn
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A guide located below the moonpool that keeps the pipe from getting bent sharply at the base of the ship
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mbrf
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Meters below rig floor
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Depth measured from the rig floor
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mbsf
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Meters below seafloor
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Depth measured from the seafloor
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PDR
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Precision depth recorder
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An instrument for estimating water depth
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PFT
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Perfluorocarbon tracer
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A dye used for microbiological cotamination tests
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RCB
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Rotary core barrel
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A coring tool
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ROP
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Rate of penetration
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A coring or drilling penetration rate
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spm
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Strokes per minute
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A circulation rate for fluids out the end of the drill pipe; 1 spm  5 gpm
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SSR
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Subsurface release
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A tool used for connecting to and releasing from casing
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UTC
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Universal Time Coordinated
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A time standard
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VIT
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Vibration-isolated television
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The camera that is lowered along the drill string
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WHC
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Wireline heave compensator
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Reduces motion of wireline tools by compensating for ship heave
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WOB
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Weight on bit
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The weight at the bit
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WOW
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Waiting on weather
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An operational delay caused by weather conditions
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WOW
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Waiting on whales
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An operational delay in using the seismic guns because whales were in the vicinity
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XCB
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Extended core barrel
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A coring tool
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