Fluid needs vary with body size, activity and temperature. Engine rooms, tropical deck work and dry air-conditioned spaces all increase losses.
Simple signs to watch
- Pale-yellow urine usually means you are drinking enough; dark urine suggests you need more.
- Headache, tiredness and poor concentration can be early signs of dehydration.
Practical habits
- Carry a refillable bottle and drink regularly through your shift.
- Drink more before, during and after hot or heavy work.
- In very hot conditions with heavy sweating, follow your ship’s heat-stress procedures, which may include rest breaks and electrolyte drinks.
- Limit sugary and energy drinks; water is best for most needs.
Heat illness is an emergency
Confusion, collapse, or hot skin with no sweating can indicate heat stroke. Cool the person, call for help and follow the ship’s medical procedures.
SeafarerFit provides educational information, health calculators, screening tools and medical-examination preparation resources. It does not provide diagnosis, treatment, medical certification or official determination of fitness for sea service.
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