SEA TOOLS

Air Draft & Bridge Clearance

Trim, draft survey & load line

How to use

Set up My Ship once (paste hydrostatics, holds, tanks from your booklet).
Work through loading in order: plan cargo, check load line, trim to finish, then survey.
Soundings feed Draft Survey deductibles; export or print trim and survey worksheets.

Example values — edit any field.

Reference worksheets only. Verify every result against your ship's approved loading computer, stability booklet, and company procedures.

Reference only — verify with official charts, pilot books, port authority and passage plan. Charted clearance datum (HAT) is a label only; you must use the correct publication for the obstruction.

Enter mean draft + trim (instead of F/A)

Draft forward (m)Draft aft (m)

Keel to highest point (m)Distance from AP (m)LBP (m, My Ship: 180)TPC (t/cm) — for lighten estimateCharted vertical clearance (m)Clearance datum (label)Tide vs datum (+ higher water, m)Required safety margin (m)

Draft at point8.333 m

Air draft36.67 m

Clearance under obstruction3.33 m

Margin after required1.33 m

PASS — margin meets required safety

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