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Mariner’s Hand

Mariner’s Hand App

Practical, offline-first apps for life at sea — built by a working ship’s officer. No clutter, no ads, no subscriptions. Just tools that do the job, even with no signal.

Compass Observation App icon Published

Compass Observation App

Quick, accurate magnetic compass-error observations — record azimuths, work out deviation, and keep your deviation card up to date. Fully offline.

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Mariner's Draft Survey icon Published

Mariner’s Draft Survey

Accurate bulk-cargo draft surveys with the maths shown — six-point drafts on a visual ship diagram, automatic mean-of-means, trim, list and density corrections, hydrostatic and tank-table interpolation, and PDF reports. Fully offline.

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DeckWatch icon Published

DeckWatch

The complete work planner for deck officers — planned maintenance, certificates, inspections, defects, rest hours and record books. Offline-first, with optional cloud sync and crew sharing.

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Free browser tools

Mariner’s Document Filler

One workbook of ship’s data fills every form a port call asks for — PDF, Word, Excel, HTML — and writes AMVER, noon reports, NOR and Letters of Protest. Runs in your browser, offline, with nothing to install.

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Built at sea, for the people who keep ships running

Every app here started as a real problem on a real voyage — then got built, tested and refined on board. If it doesn’t work mid-ocean with no signal, it doesn’t ship.