2026You know the boat. Keep the order.

You already know what to check. What's missing is the order.Boat checklists, logs and planning templates in fillable PDF.

Enter your own manual's figures once. Every later reading is compared with your boat, never with a figure written for someone else's engine.

Find the record for your boat Try a complete record free
Boat Buying Command Kit3 docs Bought separately$291 Kit saving−$114 Kit price$177
21fillable records
7systems aboard
A4 + USLetter, both included
0thresholds published

How it worksWhy we publish no thresholds

A figure written for someone else's engine

Generic limits carry the look of authority into a decision they know nothing about. So every record works in three steps, all of them yours.

  1. Your manual, once

    Transcribe your manual's figures onto the reference page, with the source beside each one.

  2. Every reading, dated

    Log what you measure, when you measure it: engine hours, temperatures, tensions, cycles.

  3. The change, visible

    Each reading sits beside your own baseline, so a drift shows up as a number you can act on.

21 records7 systems aboard

The catalogue, by system

Arranged the way a boat is actually owned. Pick a system to see its documents, one by one or together as a Command Kit.

All 21 documents

Boat Buying

Due diligence, sea trial and the offer model: everything before you sign.

See the Boat Buying collection

Boat Buying Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Engine & Drivetrain

Diesel baseline, alignment and cooling, all read against your own engine.

See the Engine & Drivetrain collection

Engine & Drivetrain Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Electrical & Power

Lithium bank, solar array and the load you actually draw.

See the Electrical & Power collection

Electrical & Power Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Rig & Sails

Tension record, sail wardrobe and a polar built from your own logs.

See the Rig & Sails collection

Rig & Sails Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Passage Planning

Float plan, offshore workbook and the night watch, written before you leave.

See the Passage Planning collection

Passage Planning Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Safety & Expiry

The locker, the spares and the medical kit, each with its next date.

See the Safety & Expiry collection

Safety & Expiry Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit

Ownership & Admin

Running costs, winterisation and the paper file that proves it all.

See the Ownership & Admin collection

Ownership & Admin Command Kit

3 documents separately$291

Kit saving−$114

Kit price$177

See the kit
Super-Pack The New Owner's Command Kit Buy Her, Cost Her, Equip Her, Lay Her Up. 4 documents. $247You keep $141 Super-Pack The Offshore Passage Command Kit Route, Watches, Power & Cooling. 4 documents. $247You keep $141

PricingThree ways to buy

Three ways to buy the same documents.

Every document costs the same. What changes is how many work together, and whether they share a reference page and a baseline.

Start here

A single document

One system, one record. Start where the boat is giving you trouble.

$97per document

  • 21 documents to choose from
  • 32 to 77 pages each
  • 619 to 1,782 live form fields
  • 4 to 10 calculation models
See every document

Kit: 2 more documents for $80

Complete system

A Command Kit

Every document of one department, sharing one baseline.

$177$291 separatelyYou keep $114

  • 3 documents, one department
  • 105 to 169 pages in total
  • 1,994 to 3,514 live form fields
  • 18 to 22 calculation models
Compare the kits

7 kits, one per department

One situation

A Super-Pack

Documents chosen for one situation: buying a boat, or crossing an ocean.

$247$388 separatelyYou keep $141

  • 4 documents, one situation
  • 153 or 184 pages in total
  • 4,049 or 4,072 live form fields
  • 22 or 24 calculation models
See both packs

2 packs, one per situation

Instant deliveryLinks appear on screen the moment payment clears and arrive by email within a minute. They do not expire.
Fully offlineNo app, no account, no connection once downloaded. It works in a shed with no signal.
Both paper sizesA4 and US Letter in every purchase, both fillable on screen and print-ready.
No published thresholdsNot one tolerance, interval or limit of ours across the whole catalogue. You transcribe yours.

Side by sideWhy not a free checklist

Free boat inspection checklist vs. the Due Diligence Kit

A free boat inspection checklist tells you what to look at. The Due Diligence Kit is a fillable PDF that records what you find on a used boat, point by point, and turns each finding into a cost you can carry into your offer.

Free boat inspection checklist vs. the Due Diligence Kit
Criterion Free boat inspection checklists The Due Diligence Kit Fillable PDF
Coverage 20 to 40 generic points, most of them cosmetic 214 points in 11 sections, title to sails
Order Points in any order, easy to skip one A fixed order: the paperwork first, then aboard
Findings A tick, and nowhere to write what you saw A finding field and your severity class, every point
Device Paper, or a notes app that fights you Fillable in Adobe Acrobat Reader, handwriting in GoodNotes or Notability
Offline use Depends on signal at the marina Fully offline, no app, no account
Reuse One boat, then it is a mess Unlimited reuse across every boat you shortlist
Negotiation output A vague list of concerns, and nothing priced Your quoted repair costs, then a defensible offer
Typical cost of a miss Found only after the sale closes Found and priced before you sign
See the Due Diligence Kit

The comparison above describes The Boat Buyer's Due Diligence Kit. It prepares you for a professional marine survey and does not replace one.

The systemNothing asserted on your behalf

Arithmetic you can audit

Every model in every document works on figures you supplied, from documentation you can name. Nothing is asserted on your behalf.

documents in the catalogue
21
thresholds we publish
0
paper sizes in every purchase
2

A reference page before any reading

Each document opens on a page where you transcribe your own figures, with the source document and page recorded beside each one. Every later comparison is made against that page and nothing else.

Models that show their working

Each model has its own table so the arithmetic is visible rather than assumed. Two of them, true wind and velocity made good, are trigonometry and hold for any vessel. The rest run on your measurements.

Counted, not estimated

Page counts, register lines and form field totals on every product page were counted, not rounded. Under our Terms those figures are a commitment, which is why they are not marketing numbers.

Yours, offline, permanently

No app, no account, no connection once downloaded. Your links appear the moment payment clears and they do not expire. A4 and US Letter are both included, every time.

Start with your system

21 documents, 7 systems aboard.

AnswersBefore you buy

Buying a used boat: the questions people actually ask

Straight answers on compatibility, offline use, and how a due diligence kit fits alongside a professional marine survey.

A question we have not answered?

Write to us and we will answer by email.

Contact us
Is this a replacement for a professional marine survey?

No, and it is not meant to be. A marine survey is a formal, insurable assessment carried out by an accredited surveyor, and you should always commission one before completing a purchase. The kit does two things a survey cannot. It lets you screen boats yourself before paying for a survey, so you only commission one on serious candidates. And it gives your surveyor a documented record of what you observed, which makes their inspection faster and better targeted.

Which app opens the fillable PDF, and does it work in GoodNotes?

Every purchase holds two editions. The Fillable edition is built for Adobe Acrobat Reader, free on computer, iPhone and Android: the fields save into the file, and every total and model calculates as you type. Apple Files also opens it and fills in the fields. The Pencil & Print edition is ruled for handwriting in GoodNotes or Notability, or on paper. These are the apps we have tested. Both editions come in A4 and US Letter.

Can I use it offline at the boatyard or during a sea trial?

Completely. There is no app, no login and no cloud dependency. Once the PDF is on your device it works with the boat out of the water, in a shed with no signal, or three miles offshore during a sea trial. Your entries save locally in your PDF reader, and you can export or email the completed file later when you are back in range.

What should I record during a sea trial?

Record RPM against boat speed across the engine's range, and note whether the engine reaches its rated maximum RPM at wide-open throttle. Log exhaust colour at start-up and under load, operating temperature over a sustained run, and any vibration through the shaft or steering. Under sail, record behaviour on both tacks, upwind and downwind, and whether the autopilot holds a course. Write it down as it happens rather than afterwards: Module 5 of the kit provides the timed sheet for exactly this, and what the readings mean for a given boat is a question for your surveyor.