| Code | Display | Definition |
| hardwire-comm |
Hardwired Communication |
Physical cable-based communication system |
| through-water-comm |
Through-Water Communication |
Wireless underwater communication system |
| surface-comm |
Surface Communication |
Communication with surface support team |
| inter-diver-comm |
Inter-Diver Communication |
Communication between divers underwater |
| full-face-mask |
Full Face Mask Communication |
Communication through full face diving mask |
| bone-conduction |
Bone Conduction Communication |
Bone conduction underwater communication |
| pneumatic-comm |
Pneumatic Communication |
Air-powered communication system |
| standard-signals |
Standard Hand Signals |
Standardized underwater hand signal protocol |
| emergency-signals |
Emergency Communication |
Emergency communication procedures |
| abort-signal |
Abort Signal |
Signal to immediately terminate dive operation |
| assistance-request |
Assistance Request |
Signal requesting help from dive partner |
| surface-immediately |
Surface Immediately |
Signal to ascend to surface without delay |
| problem-signal |
Problem Signal |
General problem indication signal |
| ok-signal |
OK Signal |
All clear/everything normal signal |
| comm-check |
Communication Check |
System communication verification |
| signal-quality |
Signal Quality Assessment |
Quality of communication signal |
| backup-comm |
Backup Communication |
Secondary communication system |
| comm-failure |
Communication Failure |
Loss of communication capability |
| range-test |
Communication Range Test |
Testing effective communication range |