Real-time NAVTEX maritime-safety decoder. 518 kHz gale warnings, SAR alerts, ice reports — CCIR-476 SITOR-B via your iPhone microphone.
NAVTEX decoder app for iPhone. Decode live maritime safety broadcasts on 518 kHz, 490 kHz, and 4209.5 kHz from a shortwave receiver using your microphone. Full CCIR-476 SITOR-B protocol with time-diversity FEC, DPLL clock recovery, 512-point FFT waterfall, and a built-in database of 42 NAVAREA coast stations. Essential GMDSS reference for mariners, radio officers, and shortwave listeners.