"Marine survey" isn't one job — it's a whole family of distinct inspection types, each triggered by a different moment in a vessel or cargo's life, each commissioned by a different party, and each producing a different kind of report. This lesson maps that whole landscape before the rest of the Learning Path goes deep on the five survey types that make up the bulk of professional practice.
What You'll Learn in This Lesson
- The full landscape of marine survey types, and what triggers each one
- The difference between a condition survey and a damage survey
- What an on/off-hire survey actually verifies, and why timing matters
- How to tell which survey type a given real-world scenario calls for
- How this lesson maps to the five survey-specific lessons ahead
The Full Landscape of Marine Surveys
Every marine survey exists to answer one of a small number of underlying questions: what condition is this vessel or cargo in right now, what changed since the last time someone checked, and who's responsible for that change. Different survey types answer that question at different moments and for different audiences:
Five of these — Cargo, Hull & Machinery, Bunker, Draft, and Marine Warranty — get their own dedicated lesson later in this Learning Path, because each is a substantial professional specialism in its own right. This lesson covers the remaining types, and gives you the map to see how all nine relate to each other.
Condition Surveys vs Damage Surveys
These two are the most frequently confused. A condition survey is a planned, routine inspection recording a vessel's state at a defined point in time — for insurance renewal, chartering, or a periodic check with no specific incident behind it. A damage survey, by contrast, is triggered by a specific event — a collision, grounding, heavy weather, or cargo incident — and exists specifically to establish cause, extent, and (often) liability. The difference isn't the areas inspected, which can overlap heavily; it's the reason for the inspection and what the resulting report is used for.
| Survey Type | Triggered By | Primary Use |
|---|---|---|
| Condition Survey | Insurance renewal, chartering, or routine schedule | Establishing a baseline state, not investigating an incident |
| Damage Survey | A specific incident — collision, grounding, heavy weather, cargo loss | Establishing cause, extent, and liability |
| On/Off-Hire Survey | Start or end of a charter period | Recording condition at handover, to settle disputes over who caused what damage |
| Pre-Purchase Survey | A pending vessel sale or acquisition | Giving a buyer or financier an independent view of what they're actually acquiring |
On/Off-Hire Surveys: Why Timing Is Everything
An on/off-hire survey is conducted at the exact moment a charter begins (on-hire) or ends (off-hire), recording the condition of structural areas most likely to sustain damage during the charter — deck, holds, hatch covers, cargo gear, rails and walkways. A bunker survey is typically conducted alongside it, since fuel quantity is also a handover concern. The entire value of this survey type depends on precise timing: a survey conducted a day late, after cargo operations have already begun, can no longer reliably distinguish pre-existing condition from new damage — which defeats the purpose of doing it at all.
Download the Survey Types Reference Chart (PDF)
A single-page map of all nine survey types, what triggers each one, and who typically commissions it.
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Exercise: Which Survey Type Is This?
Read each scenario and select the survey type it calls for.
1. A vessel is due for its annual insurance renewal, with no specific incident to investigate.
2. A charter period ends today, and the parties need a record of the vessel's condition at handover.
3. A vessel has just run aground, and the owner needs to establish the extent of hull damage.
4. A buyer is considering acquiring a second-hand vessel and wants an independent view before completing the purchase.
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Frequently Asked Questions
What's the difference between a condition survey and a damage survey?
A condition survey is a planned, routine inspection with no specific incident behind it; a damage survey is triggered by a specific event and exists to establish cause, extent, and liability.
Why does timing matter so much for an on/off-hire survey?
A survey conducted after cargo operations have begun can no longer reliably distinguish pre-existing condition from new damage, defeating the purpose of the survey.
Who commissions a pre-purchase survey?
Typically the prospective buyer or their financier, to get an independent view of the vessel's condition before completing a purchase.
Which survey types get their own dedicated lesson later in this path?
Cargo, Hull & Machinery, Bunker, Draft, and Marine Warranty surveys — each a substantial specialism covered in its own lesson.
Is a bunker survey ever combined with another survey type?
Yes — a bunker survey is commonly conducted alongside an on/off-hire survey, since fuel quantity is also a handover concern.
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