Free browser tools
Small, practical tools that run in your browser — nothing to install, no account, and nothing leaves the computer they run on. Built by a working ship’s officer.
Which coast station to send the weekly DSC test call to, and on which band. Give your position and the stations come nearest first, each band coloured by whether it has been answering lately, from ships’ own reports, and faded where it is usually out of reach at this time of day. Tested one yourself? Report it: it helps the next ship.
One workbook of ship’s data fills every form a port call asks for — PDF, Word, Excel, HTML — and writes the text messages too: AMVER, noon reports, Notice of Readiness, Letters of Protest. Everything happens inside your browser: no account, no server, no internet. Crew passport numbers never leave the computer they are typed on.
Four jobs in one. Moisture ventilation by both the dewpoint rule and the three-degree rule, so you see when they agree and when they do not. Coal and other gas-monitored cargoes with a CO trend across readings. Enclosed space gas records. And paint conditions with a coverage and quantity estimate. Log it, export to Excel, open it again next watch.
The units a deck officer actually reaches for — length and soundings, volume, mass, density, stowage factor, speed, pressure, TPC and MTC. The three different tons are spelled out so a long ton is never mistaken for a short one, stowage factor and density are crossed properly as reciprocals rather than fudged with a factor, and the cargo intake question a stowage factor is looked up to answer — broken stowage included — is worked out on the page. Every answer shows its arithmetic.
What the anemometer reads, and what the wind is actually doing — both ways round. The relative angle goes in as Port, Starboard or 000–360 and is echoed back in the other form. Because the mast points along the ship’s head, the relative wind is worked from the heading and never the course. And since taking the motion over the ground out gives a different answer from taking the motion through the water out, both are shown, labelled, with the drift angle that separates them. Beaufort force included, and the vector working laid out step by step.
Read between the rows of a ship’s table — soundings, hydrostatics, whatever is in front of you. It holds no tables of its own: you type the two rows either side and it does the arithmetic. Corrections chain the way a sounding table actually prints them, so “deduct the trim correction” is a Subtract and a positive number, never a minus sign you had to add yourself. There is a four-corner mode for the rarer table indexed by two things at once. Every step is shown — the correction, the running total, and a flag on any step read outside its two rows.
Under-keel clearance worked per waypoint against one policy you set once. Squat from the charted depth and draft, roll and pitch allowances from the beam and LOA, tide and datum, and CATZOC as your company uses it: in the minimum UKC, as a percentage or your own equation per band, or taken off the charted depth, with one minimum for every leg. Every leg comes out pass or fail, with the safety, shallow and deep contours beside it. Bulk entry fills a value across a run of waypoints, and a blank field there changes nothing. Save the plan as a file and open it again next passage.
A structured way of thinking a job through before it starts. A library of 63 jobs, 36 conditions, 55 hazards and 65 controls offers prompts — and stops there. It never suggests how likely something is or how bad it would be, and nothing is ever ticked for you. The method runs at two levels: judged first with the controls already in place, then again after any further measures, with the two shown side by side so a reader can see whether anything moved. Print it, export it to Excel, or save it as a file.
Step-by-step walkthroughs of the tools, straight from the playlist — search for a tool or a task, or browse with the arrows. New videos appear here as they are added.
More bridge and cargo tools are in the works. Got one you wish existed? Tell me about it.