Mariner's Draft Survey — professional draft survey calculator for ship's officers

Calculate your draft survey with confidence.

Built by a Chief Officer. Made for mariners.

Get it on Google Play

Mariner's Draft Survey is a professional tool for ship's officers to calculate cargo quantities during draft surveys on bulk carriers — replacing paper worksheets and error-prone manual arithmetic. From the six drafts to the final cargo figure, it shows the working behind every number. No ads, no tracking, and it works fully offline.

Everything in one place

From the drafts to the final cargo figure — with the working behind every number.

Drafts

Six-point draft entry

Forward, midship, aft — port & starboard — with a clear visual ship diagram.

Corrections

Automatic corrections

Mean of means, trim and list corrections handled for you.

Hydrostatics

Hydrostatic interpolation

Precise interpolation from your own vessel's tables.

Deductibles

Deductibles & density

Sounding tables for ballast, fresh water, fuel and more, plus dock-water density.

Cargo

Net cargo by difference

Light ship and constant handling for the final cargo figure.

Transparent

Show your work

Tap any result to see the exact formula and the numbers behind it.

Your data

Vessels & history

Import tables from Excel/CSV, save vessel profiles, keep a full survey history.

Reports

Clean PDF reports

Export professional reports ready to hand over.

Offline

Works anywhere

100% offline. No ads, no tracking, no sign-up — no data leaves your device.