01
Word-level tracking
Marks follow their exact words into the new revision, even when the layout changes.
EFB document system for iPad · Patent pending
Your notes follow the exact words.
Changes never hide inside them.
An iPad reader for flight manuals. When a revision arrives, every highlight and note moves with its exact words — and anything that changed is flagged.
The problem
Every revision puts a pilot's marks at risk
Pilots build years of highlights and notes. A new revision strands them, or moves them without saying what changed underneath.
Other EFB apps anchor a mark by its two ends. Words inserted between the ends get swallowed. The pilot sees a familiar yellow bar and reads straight past the change.
“A highlight that quietly covers a new word is a safety problem.”
- Every word has an identity. A mark belongs to its words, not to two points.
- Flag, don't absorb. A changed word inside a mark is boxed, never hidden.
- Never guess. An uncertain move goes to review, not to the wrong spot.
What sets it apart
Six things other EFB document apps don't do
02
Changes inside a mark are flagged
An added, deleted or changed word is boxed and flagged, never silently absorbed.
03
No guessing
If a mark's new place isn't certain, it is set aside for review.
04
Show Change
Tap a change bar to read old and new wording side by side.
05
Read file and FCIFs
Read to the last page, sign with Face ID. Only then is the manual marked.
06
Sourced Pilot Notepad
Study notes built from manual passages that re-verify every revision.
Show Change
A revision you can actually read
Revision B of the demo manual opens on its list of changes. Tap any Show. The prior wording appears beside the new, from the signed Rev A data.
- Old beside new, word for word.
- Nothing composed. Both columns are the publisher's text.
- Revision and date never leave the top of the screen.
- The PDF is never written to.
Demo Flight Manual
Rev B · Effective 2026-10-01
Record of revisions
Revision A. 1 Sep 2026
Revision B. 1 Oct 2026
List of changes
Page 3: Folding stools limit. The number of folding stools a visitor can borrow was changed.
Page 45: Demonstration area altitude rule. Flying over the demonstration area below the stated height is no longer permitted.
Page 15: Lost property tray. The note on unclaimed umbrellas was joined to the paragraph before it.
Page 19: Display day planning. The number of tables near the entrance and the length of the volunteer rotation were changed.
Real text from the demonstration manual's Rev A and Rev B. Differences are computed in your browser, word by word.
Offline semantic search
Ask in your words. Get the manual's words back.
Plain-language search that runs entirely on the iPad and never writes a sentence of its own.
- Offline. The model runs on the device. Nothing leaves it.
- Deterministic. The same question returns the same passages, every time.
- Verbatim and cited. Results are the manual's own paragraphs, with the page.
- Scoped. This manual, this folder, every manual, or your open tabs.
Search · All manuals
On device · nothing generated
can visitors take the stools home
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A visitor may borrow up to two folding stools from the welcome desk and must return them before leaving the field.
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Loaned equipment, including stools, umbrellas and hearing protection, remains the property of the display committee.
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Items left by visitors are kept in the lost property tray for thirty days.
The manual never says “take home”. The search understood the question and returned the manual's own rule, word for word.
Illustration, invented manual.
The patent
Two US provisional applications
Filed September and October 2026
Every word in the manual has its own identity. A mark moves only to the exact words the pilot selected; any insertion or deletion inside it is flagged; an uncertain move is held for review.
Matched by identity, not position, so a mark follows its sentence even thirty pages away.
Built for the flight deck
A Type B EFB document viewer from the first line of code
Held to FAA AC 120-76E and AC 91-78A.
- Fully offline on iPad.
- No AI hallucinations. Ever. The word map provides the exact text and never infers.
- Revision and effective date always visible.
- Signed, tamper-evident bundles. A bad bundle never replaces a good one.
- The official PDF is never modified.
- Degrades gracefully to plain PDF viewing. Never fails closed.
Military flight operations
Manuals, instructions and FCIFs on a controlled iPad.
Airlines and operators
Fleet manuals that change often, read by crews with years of notes.
Training commands
Search in your words, get the manual's words back.
Any controlled document
Maintenance, medicine, regulation.
Read file, bulletins and FCIFs
The read file lives in the manual, not in a binder down the hall
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1
It arrives
The library counts what's unsigned: “3 FCIFs to sign before flight.”
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2
Read to the last page
The sign button does not appear until the last page is read.
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3
Sign with Face ID
Written to a hash-chained, append-only log. Exportable for ground records.
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4
Published into the manual
Only now are the affected lines marked, memo one tap away. The marks follow the next revision.
Sourced Pilot Notepad
Study notes that know where they came from
A note copied from a manual goes stale the day the manual changes, and nothing tells you.
DataStone notes mix your words with passages lifted verbatim from the manual. Each passage keeps its source. When a revision lands, every passage is re-checked: verified, flagged as changed, or listed as not found. Never silently kept.
Study sheet — airshow procedures
Altitude floor over the demo area — know this cold.
Aircraft may overfly the demonstration area only at or above 1,000 feet, remaining clear of the crowd line.
Folding stools limit — number changed last rev.
A visitor may borrow up to two folding stools from the welcome desk.
The north hangar door is closed during the flying display.
Where it stands
Built, and what's next
In the demo build
Word-level marks that survive revisions · flagged changes · Show Change · read-and-sign FCIFs · offline semantic search · sourced notepad.
Planned
CUI handling · MDM deployment · DoD PKI · on-premises first, IL5 later.
Coming
Help for students moving from FAA rules to Air Force instructions.
Watch a revision land on a marked-up manual
Thirty minutes on an iPad. Bring your hardest case.