| Acronym | Meaning |
 | NUSRL | Naval Underwater Sound Ref Lab |
 | TESSDL | Training Equipment Sub-system Data List |
 | MSB | Minesweeping Boat (mine Countermeasures) |
 | LORAN | Long Range Navigation |
 | OT&E | Operator Training & Evaluation |
 | TTT | Team Tactics Trainer |
 | NTDS | Navy Tactical Data Systems (lab) (20f17) |
 | IFPM | In Flight Performance Monitoring |
 | CONT | Control |
 | DAC | Document Availability Code |