Glossary · Equipment

Dive Slate

A dive slate is a robust, waterproof writing surface, typically measuring 10-25 cm (4-10 inches) in length and 7-18 cm (3-7 inches) in width, designed for underwater communication and note-taking. It allows divers to write or draw messages that can be easily shared with buddies or recorded for later recall.

Crafted from durable plastic or similar materials, slates withstand the underwater environment, resisting pressure and corrosion. They are an indispensable tool for enhancing safety, improving communication efficiency, and documenting observations without the need for complex hand signals or vocalisation, which is impossible underwater.

For liveaboard diving, a dive slate becomes particularly valuable. On multiple daily dives in varied locations, divers often need to communicate specific observations about marine life, dive site conditions, or plan intricate multi-level dives. A slate facilitates clear, silent communication with your buddy or dive guide, ensuring everyone is on the same page, enhancing both safety and the enjoyment of your remote diving adventure.

1At a glance

Typical Material
High-impact plastic (e.g., PVC, ABS)
Common Size Range
10-25 cm (4-10 in) length, 7-18 cm (3-7 in) width
Writing Tool
Graphite pencil or specialised underwater pen
Attachment Method
Lanyard, bungee, or carabiner clip
Weight (Avg. Small Slate)
50-150 grams (1.8-5.3 ounces)
Buoyancy
Typically slightly negative or neutral
Depth Rating
Generally rated to recreational dive limits (40 metres / 130 feet) or beyond
Colours
White (most common), translucent, or yellow

2Types of Dive Slates

Standard Slates: These are simple, rigid plastic boards, often rectangular or contoured, with a pencil attached via a lanyard. They come in various sizes, from small wrist-mounted versions to larger models for detailed note-taking. Their simplicity makes them durable and reliable.

Wrist Slates: Designed to strap to a diver's forearm, wrist slates offer easy access and keep both hands free. They are often smaller, with multiple hinged leaves to provide more writing surface. Ideal for quick notes or essential information.

Wet Notes: While not strictly 'slates', wet notes are waterproof notebooks with synthetic paper pages that can be written on underwater. They offer a larger, multi-page format for extensive logging, surveying, or dive planning, and are particularly popular with scientific or technical divers.

4Essential Uses Underwater

Communication: The primary function of a dive slate is to facilitate clear communication between divers. This is crucial for conveying complex ideas that hand signals cannot cover, such as asking specific questions about marine life, confirming air supply, or detailing safety procedures. It prevents misunderstandings, especially in low visibility or high current.

Data Recording: Divers often use slates to record observations during a dive, such as sightings of specific marine species, water temperature, depth profiles, or bottom times for specific locations. This data can be vital for research, post-dive debriefs, or simply remembering details of a memorable dive.

Dive Planning & Safety: Before a dive, slates can be used to jot down critical dive plan elements, such as depth limits, decompression stops, or navigation routes. During a dive, they can be used to draw out complex navigation cues, clarify emergency procedures, or detail a lost diver search pattern, greatly enhancing safety.

5Dive Slates on Liveaboard Trips

Enhanced Group Cohesion: On a liveaboard, you'll be diving with a group, often with divers of varying experience levels or from different countries. A dive slate bridges communication gaps, ensuring everyone understands dive briefings, underwater tasks, and shared observations, leading to a more harmonious and enjoyable group experience.

Optimising Dive Time: When you're making multiple dives a day, efficient communication means less time spent trying to convey messages and more time observing marine life or exploring wrecks. A quick note on a slate can save valuable bottom time, ensuring you make the most of every dive in remote locations.

Documentation of Unique Sightings: Liveaboards take you to some of the world's most pristine and biodiverse dive sites. Using a slate to quickly sketch a rare creature, note its behaviour, or record specific details of a wreck helps you retain these incredible memories and accurately log your dives later, making your trip truly unforgettable.

6Common misconceptions

Myth: Dive slates are only for beginners or students. Fact: Experienced divers, instructors, and even technical or scientific divers regularly use slates. They are invaluable for precise communication, complex planning, and detailed data collection that hand signals simply cannot convey, regardless of experience level.

Myth: A dive slate is unnecessary if you know basic hand signals. Fact: While hand signals are crucial for basic safety and communication, they have limitations. A slate allows for specific questions, drawing diagrams, spelling out names, or clarifying nuanced instructions that hand signals cannot address, significantly enhancing clarity and safety.

Myth: You can just use a waterproof phone or tablet for notes. Fact: While some devices are waterproof, dedicated dive slates are purpose-built for the rigours of diving – resistant to drops, scratches, and extreme pressure without battery concerns. They are simpler, more reliable, and don't introduce digital distractions or failure points underwater.

FAQ

What is a dive slate used for?

A dive slate is primarily used for underwater communication between divers, allowing them to write or draw messages. It's also used for recording observations, dive planning, or noting safety-critical information during a dive.

What do I write with on a dive slate?

Most dive slates come with a standard graphite pencil, often attached by a lanyard so it doesn't get lost. Some advanced slates use specialised underwater pens with indelible ink, but pencils are generally preferred for ease of erasing.

How do you clean a dive slate?

To clean a dive slate, simply rinse it thoroughly with fresh water after each dive to remove salt, sand, and other debris. If there are stubborn marks, a mild soap and a soft brush can be used, then rinse again. Ensure any pencil remnants are also cleaned off.

Are dive slates buoyant or do they sink?

Most dive slates are designed to be neutrally buoyant or slightly negatively buoyant, meaning they will either hover in the water or slowly sink. This prevents them from floating away if accidentally dropped, making them easier to retrieve.

Can you erase writing on an underwater slate?

Yes, writing on a dive slate (with a pencil) can be easily erased underwater or on the surface. Divers typically use a rubber eraser on the pencil or a finger, rubbing the pencil mark to smudge it away. Some slates have an integrated eraser pad.

Is a dive slate mandatory for diving?

While not strictly mandatory like a BCD or regulator, a dive slate is highly recommended for all divers, especially when diving in unfamiliar environments or with new buddies. It significantly enhances communication and safety, making it a crucial piece of equipment for many.

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