Marine
What is a draft survey?
A high-level explanation of how draft surveys may support cargo quantity assessment.
Updated 2026-08-20 / 4 min read
A draft survey may be requested when cargo quantity is being assessed through vessel draft observations and related vessel information. The exact scope depends on the instruction, vessel data, conditions and access.
The situation
Bulk cargo is being loaded or discharged and the appointing party needs quantity information supported by independent observations.
What it helps establish
At a high level, observed vessel drafts are used as part of determining vessel displacement. Differences before and after cargo operations may support assessment of cargo loaded or discharged.
What may matter
- Observed drafts where accessible.
- Relevant vessel particulars and data made available.
- Cargo operation timing and location.
- Environmental and operational conditions affecting review.
Operational note
Detailed formulas, correction tables and tolerances require practitioner-approved methodology and are not published here.
When attendance may help
Independent attendance may be useful where quantity is material, disputed, commercially sensitive or needs a documented field record.
Ocean Intelligence provides general informational guidance. Specific circumstances may require professional, contractual, legal or insurance advice.
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