Table T2. Operation acronyms.
| Acronym | Definition | Comments |
|---|---|---|
| APC | Advanced piston corer | Coring tool |
| APCT | Advanced piston corer temperature tool | APC coring shoe with thermistors for making temperature measurements |
| BCR | Bi-centered reamer | Bit used to open holes to a larger diameter than the bit diameter |
| BHA | Bottom-hole assembly | Bit, thick-wall joints of pipe, and other parts that are at the bottom of the drill string |
| CADA | Cam-actuated drill ahead | Casing running tool made by Drill Quip |
| DDI | Downhole Designs, Incorporated | Company |
| DP | Dynamic positioning | Shipboard navigation system |
| EOP | End of pipe | End of the pipe |
| FMS | Formation MicroScanner | Logging tool |
| gpm | Gallons per minute | Circulation rate for fluids out the end of the drill pipe |
| GPS | Global Positioning System | Satellite navigation system |
| GUATB-03C | Guatemala Basin site selected for drilling | Now known as Site 1256 |
| LGH | Lower guide horn | Guide that keeps the pipe from getting bent sharply at the base of the ship |
| mbrf | Meters below rig floor | Depth measured from the rig floor |
| mbsf | Meters below seafloor | Depth measured from the seafloor |
| PDR | Precision depth recorder | Instrument for estimating water depth |
| PFT | Perfluorocarbon tracer | Dye used for microbiological contamination tests |
| RCB | Rotary core barrel | Coring tool |
| ROP | Rate of penetration | Coring or drilling penetration rate |
| spm | Strokes per minute | Circulation rate for fluids out the end of the drill pipe; 1 spm ≅ 5 gpm |
| SSR | Subsurface release | Tool used for connecting to and releasing from casing |
| TDC | Tapered drill collar | Tapered heavy-walled tubular that is part of the BHA |
| UTC | Universal Time Coordinated | Time standard |
| VIT | Vibration-isolated television | Camera that is lowered along the drill string |
| WHC | Wireline heave compensator | Reduces motion of wireline tools by compensating for ship heave |
| WOB | Weight on bit | Weight at the bit |
| WOW | Waiting on weather | Operational delay caused by weather conditions |
| WOWh | Waiting on whales | Operational delay in using the seismic guns because whales were in the vicinity |
| XCB | Extended core barrel | Coring tool |
Notes: WSTP = Water Sampling Temperature Probe, APCT = Advanced Piston Corer Temperature tool, FMS = Formation MicroScanner, RCB = Rotary Core Barrel, NDT = nondestructive testing, DC = drill collar, BHA = bottom-hole assembly, WST = Well Seismic Tool, UBI = Ultrasonic Borehole Imager.
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