Instructions

Tap Listen and allow camera and microphone access. Lightline watches for flashes and listens for its 800 Hz Morse tones automatically. Keep the page open while listening. For flashlight messages, center the other phone’s LED and zoom to exclude nearby lights.

Pick Light or Tone, type a message, and tap Send. Tone uses your phone speaker. Lightline automatically shortens eligible words when it saves time and restores them on another V15 or newer receiver. Lightline pauses listening during your transmission and resumes afterward.

Turn on Repeat until stopped if the other phone might join late. Each copy has a start and end signal. Tap Stop sending to take a reply.

The flashlight emits repeated flashes. Avoid pointing it at anyone sensitive to flashing lights.

Morse alphabet

Letters, numbers, and punctuation supported by Lightline.

ITU International Morse code

Shorthand dictionary

Tap a code to insert it in your draft. Add a question mark to ask a Q-code question. Entries are sent as ordinary characters. Joined prosigns use different timing and are outside this picker.

ITU maritime Q-codes · ARRL operating aids · CWops · RSGB