Mariner's Draft Survey

Mariner's Draft Survey is a professional draft survey calculator for ship's officers — built to replace paper worksheets and error-prone manual arithmetic when calculating cargo quantities on bulk carriers.

Made by a Chief Officer for working mariners, it follows the survey exactly the way you do it on board, from drafts to final cargo figure, and shows the working behind every number.

WHAT IT DOES
• Enter the six drafts (forward, midship, aft — port and starboard) with a clear visual ship diagram
• Automatic mean of means, trim correction and list correction
• Hydrostatic interpolation from your own vessel's tables
• First and second trim corrections
• Density (dock water) correction
• Deductibles — ballast, fresh water, fuel oil, diesel and more — from tank sounding tables
• Net cargo by difference, with light ship and constant handling
• Cargo loaded / discharged figures for initial and final surveys

SHOW YOUR WORK
Every result opens to reveal the exact formula and the numbers behind it — so you can verify the calculation, not just trust it. Ideal for cross-checking against the surveyor.

YOUR VESSEL, YOUR DATA
• Import hydrostatic and tank tables from Excel or CSV
• Save vessel profiles and reuse them survey after survey
• Keep a full history of past surveys
• Export a clean, professional PDF report to hand over

WORKS ANYWHERE
The app is completely offline. No account, no sign-up, no internet connection, no ads, and no data ever leaves your device — so it works at sea, in port, or in cargo holds with no signal.

WHO IT'S FOR
Chief officers, cargo officers, deck officers, ship surveyors, superintendents and maritime students who need fast, accurate draft survey calculations on bulk carriers.

KEY FEATURES
• Six-point draft entry with visual ship diagram
• Mean of means, trim and list corrections
• Hydrostatic and tank-table interpolation
• First / second trim and density corrections
• Deductibles from sounding tables
• Vessel profiles and survey history
• Excel / CSV import and PDF report export
• Formula popups on every calculation
• Fully offline — no ads, no tracking

Calculate your draft survey with confidence. Download Mariner's Draft Survey and turn an hour of paperwork into a few minutes of clean, checkable figures.