Why are reels and guidelines important for wreck diving?

They ensure divers can safely navigate and exit overhead environments by maintaining a clear route.

What are the general rules for guideline use?

Only dive with proper training, avoid crossing lines, use your own if in doubt, and follow 'first in, last out' protocols.

What should be included in a wreck diving reel kit?

Primary and backup reels or spools, directional and non-directional line markers, and personal ID markers.

Where can I practice guideline diving on Koh Chang?

At HTMS Chang Wreck for real wreck penetration and T11 Wreck for confined drills.

What are line markers for in wreck and cave diving?

They provide orientation, team communication, and a clear exit path. Types include directional arrow markers, non-directional reference markers, and personal cookies with initials.

What is the difference between an arrow marker and a non-directional marker?

An arrow always points toward the exit. A non-directional marker only marks a location (e.g. start of a jump line) without showing direction. Teams often place an arrow about 15 cm before a non-directional marker at junctions.

Reel & Guideline Use for Safe Wreck Diving

Using Reels and Guidelines for Safe Wreck Diving

Welcome to your Wreck Diving or Advanced Technical Wreck Diving course with Chang Diving Center! This guide introduces the essential skills for using reels and guidelines during wreck or cave penetration dives. Safety and control depend on preparation, teamwork, and good technique.

🧰 Required Equipment

Reels or Spools – Primary and backup
Line markers – Directional, non-directional, and personal markers

🛠️ Preparing Your Line

Unwind and inspect the full length of your line for damage or tangles.
Ensure line markers are clean, labeled with initials, and ready to deploy.
Plan your dive as a team:
- Diver 1: Deploys the line
- Diver 2: Maintains light and communication
- Diver 3: Supports and assists with tie-offs

📏 General Rules for Line Handling

Only dive in overhead environments with proper training and certification.
If unsure about an existing line’s condition, lay your own guideline.
Never cross another line; place yours neatly below any existing guideline.
First in, last out: The lead diver enters first and exits last.

📌 Line markers (wreck & cave)

In wreck and cave diving, line markers are essential safety tools. They provide orientation, team communication, and ensure a safe exit path.

🔸 1. Arrow marker (directional)

Always indicates the direction to the exit
Must be clearly oriented
Used at decision points and intersections

Typical use:

At junctions
In complex environments
To confirm exit direction during low visibility

White plastic directional arrow line marker on a wreck or cave diving guideline, pointing toward the nearest exit — Directional arrow marker: always clip and orient it so the arrow shows the way to the exit.

🔸 2. Non-directional marker

Marks a specific location or reference point
Provides no directional information

Typical use:

Start point of a jump line / side line
Marking important locations inside the wreck or cave

White non-directional reference line marker on a guideline for wreck or cave diving — marks a junction or tie-in without showing exit direction — Non-directional marker: use with a separate arrow placed about 15 cm ahead toward the exit at junctions.

🔸 3. Cookie (personal marker)

Personal marker with name or initials
Used for team identification

Typical use:

Placed on the line before penetration
One marker per diver

White personal cookie line marker for wreck and cave diving — clipped on the guideline with diver initials for team identification before penetration — Personal cookie: label with your initials so the team knows who is still inside the overhead environment.

🔻 Preparing line markers

Standard procedure for professional dive teams:

Each diver carries their own full set of markers
All markers are clearly labeled (name or initials)
Before the dive:
- Check completeness
- Ensure secure attachment to harness
- Markers must be accessible without visual contact

🔻 Practical team procedure

🧭 Before penetration

Diver 1 secures the guideline — using at least two solid tie-offs outside the wreck
Each team member places one personal cookie directly on the line before entering

Result: clear identification of all divers inside the system.

🧭 During penetration

Diver 1 lays the guideline
Diver 2 manages light and communication
Diver 3 support, monitoring, backup

At junctions / side lines:

Diver 1 places a non-directional marker (reference point) and, about 15 cm before it, an arrow marker pointing to the exit
Attach the jump / side line at the non-directional marker, then continue penetration

🧭 At the turn point

Once the planned limit is reached, rotate roles:

Diver 3 becomes Diver 1
Diver 2 stays in position
Diver 1 becomes Diver 3

Why: a fresh diver leads the exit; the original line-layer retrieves the line.

🧭 Exiting the wreck / cave

The new Diver 1 leads the team out
The original Diver 1 (now Diver 3) retrieves the guideline during exit
All markers are removed — leave no trace

🔻 Important note

Line markers are not optional — they are critical safety tools, especially in low visibility.

Common mistakes:

No clear arrow placement
Missing cookies
Unlabeled markers
Incorrect placement sequence

🔗 Penetration Procedures

Secure your reel outside the wreck at a fixed and solid anchor point. Always use a primary and a secondary tie-off to ensure line integrity. Keep your line around 15 cm off the bottom to avoid entanglement or silt-out. Avoid sharp edges or surfaces that could damage the guideline. Place directional markers at all turns and junctions to mark the way out.

📍 Recommended Dive Sites for Practice

HTMS Chang Wreck – Perfect for multi-level penetration practice
T11 Wreck – Ideal for confined line drills

🎥 Video Tutorial: Reel & Guideline Techniques

Watch our video guide to see proper line handling in action: