Ship OHC (Overhead Clearance)
- Admin
- Sep 11
- 1 min read
Updated: Sep 13
🚢 What is Ship OHC (Overhead Clearance)?
Overhead Clearance is the vertical distance between the highest point of the ship (mast, funnel, or antenna) and the lowest point of any overhead obstruction (bridge, power line, crane, etc.).
In simple terms — OHC is the “safety gap” above your ship.
🧭 Why is Ship OHC Important?
Prevents collisions with bridges or cables ⚠️
Ensures safe port access — many terminals have restricted overhead space.
Protects navigation equipment (radars, antennas) and avoids structural damage.
Keeps voyage on schedule — hitting an obstruction can lead to costly delays or detentions.
📅 When Do We Need to Consider OHC?
OHC must always be checked when:
Passing under bridges 🏗️
Navigating near power lines ⚡
Entering or leaving ports and terminals
Berthing where cranes or gantries cross overhead
Just like UKC, OHC depends on multiple factors — tides, trim, squat, air draft of the vessel, and even weather (e.g., swell).
Instead of rough estimates, use our interactive Ship OHC (Overhead Clearance) calculator on Master Work Station (MWS). It’s built for mariners who want quick, reliable results following real shipboard practice.
👉 Try it now: www.master-workstation.com
⚠️ Important Note for All Mariners
Always follow your company’s OHC policy. Check the required minimum overhead clearance for the area and passage plan.
If OHC is below company limits, contact your Marine Superintendent for risk assessment and approval.
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