Free Tool
Quick Reference for Underwater Communication
A searchable database of scuba diving signals — hand signals, light signals, touch contact signals, and fish identification signals. Organized by category, with clear illustrations. Always available, even without a signal.
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What Dive Signals Does
A searchable reference for every type of underwater communication.
Dive Signals is a comprehensive reference for underwater communication. It covers four signal categories: core hand signals used on every recreational dive (OK, up, down, low on air, safety stop), technical hand signals for advanced diving (switch gas, deco stop, valve drill), light signals for night and cave diving (OK, attention, emergency), and touch contact signals for zero-visibility conditions.
The database also includes a fish identification signal section — standardized hand shapes that let dive buddies identify marine life underwater without surfacing. Each signal includes a clear illustration and description of when and how to use it.
A fuzzy search function lets you find signals quickly by name or keyword. Signals are grouped by category with clear headers, making it easy to browse or study before a dive. The entire database works offline — load it before the dive trip and access it anywhere, even on a liveaboard with no cell service.
- Core hand signals for recreational diving
- Technical hand signals for advanced diving
- Light signals for night and cave diving
- Touch contact signals for zero-visibility
- Fish identification signals
- Fuzzy search by name or keyword
- Categorized with clear illustrations
- Works 100% offline — study on the boat
Standardized Underwater Communication
Dive signals follow conventions established by major training agencies (PADI, SSI, GUE, TDI). Core signals like "OK," "up," "down," and "low on air" are universal across agencies. Technical signals (gas switch, deco stop) follow GUE/TDI conventions common in technical diving. Light signals use standardized patterns: circle for OK, rapid side-to-side for attention, and rapid up-and-down for emergency. DiveKit's database covers all major conventions so you can communicate clearly with any buddy.
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