Seven challenge modes
Hoist Decode, Unknown Signal, Find the Flag, Reading Arms, Message Builder, a sixty-second Speed Watch and a Combined Watch.
How it works
Stand your first watch
A course of short modules, each ending in an exam. Learn a few signs, prove you know them, and the next module opens.
Study a module
16 modules in two courses: nine of flags, seven of semaphore. Each one brings a handful of signs and a short brief.
Stand a watch
Practice in watches of 8, 12, 16 or 20 questions. Read hoists, pick flags, set arms and build messages.
Pass the exam
Score 80 percent to pass. A passed module opens the next, so you never get ahead of what you know.
Review & rank up
Signals you fumble come back in a review queue. Earn points, win awards and climb seven ranks.
Two languages
Flags to read.
Flags to read.
Arms to wave.
Forty code flags for a hoist, and the semaphore alphabet for a signaller with two flags in hand. Tap one below.
Signal flags
26 letters, 10 numeral pennants, 3 substitutes and the answering pennant
Semaphore
Eight positions, 45° apart. Every letter uses two.
On board
Everything a signaller needs
Composer & Decoder
Bend flags onto a mast and read what they say, or type a message and see it as a hoist and as semaphore. Share any hoist as a picture.
Semaphore Trainer
Drag your own two arms around the dial and set each letter. The app checks your positions and counts your streak.
Logbook
Every watch is written down: accuracy, speed, an error map and a record for each sign. See which signals need work.
An illustrated archive
Signal tables, ships and stations, and the history from Chappe's towers to Trafalgar. Flag meanings follow the International Code of Signals.
Offline & private
No account, no ads, no tracking. The app works fully offline and sends nothing anywhere. Your progress stays on your device.
The archive
Plates from the locker
Original drawings in warm gouache, each with a caption you can trust. Swipe along.
A Hoist Aloft
Signal flags flown from the yardarm, where they blow out clear of smoke.
Popham's Numbers
Trafalgar, 21 October 1805: England expects that every man will do his duty.
The Blue Peter
Flag P at the yard before sailing: all persons report on board.
Pilot on the Ladder
G asks for the pilot, H says the pilot is aboard.
On the Bridge Wing
Hand flags are fast at short range, when two stations can see each other.
Signal by Lamp
Flashing light carries the same code by night.
Seven ranks to earn
Fifteen awards to win
Radio room
Send a signal
Questions, a sign that looks wrong, or an idea for the next module? Write to post@rindwell.click.
Hoist your first flag
Free on the App Store. Ten minutes a day and the sea starts to talk.
Download on theApp Store