Marine Survey · Online
Marine Survey Reports. Made field-ready.
Draft survey and bunker survey software for professional marine surveyors — offline-first workflows, report-ready structure and free maritime calculators for field checks.
2
free report credits
Offline-first
field workflows
PDF-ready
survey reports
Free marine survey calculators
Fast checks for draft, bunker, tank and voyage work.
Use browser-based tools for interpolation, hydrostatics, tank capacity, density, trim/list corrections, fuel consumption, stability, under-keel clearance and more.
- InterpolationFreeLinear and bilinear lookup for survey tables and correction values.
- HydrostaticFreeCalculate vessel hydrostatic values from ship table data.
- Wedge VolumeFreeEstimate liquid cargo wedge volume or gauge-point trim/list correction for OBQ, ROB and free-water conditions.
- Tank CapacityFreeApply tank volume corrections using capacity table references.
- Avg DensityFreeCalculate blended density from multiple density readings.
- Fuel ConsumptionFreeProject voyage fuel by grade and reconcile ROB consumption.
- Squat / UKCFreeCheck under-keel clearance with squat allowance.
- Stability (GM)FreeEstimate metacentric height and basic transverse stability.
- Engine SlipFreeCompare propeller speed with vessel speed to estimate slip.
- ETAFreeEstimate arrival time from distance and vessel speed.
- Tank InclinationFreeCorrect sounding or ullage readings for tank trim/list from gauge point to reference point.
- Unit ConverterFreeConvert common marine survey units quickly.
- PP CorrectionFreeCorrect observed drafts to perpendicular reference positions.
- Hull DeflectionFreeCalculate Mean of Means draft and hogging or sagging indication from corrected F/M/A drafts.
- Missing Draft EstimatorFreeEstimate one unreadable draft mark from available readings.