Version 1.5 is now available, which supports Bluetooth audio devices. So now you can directly decode audio from your radio, without using an audio cable.
HF Weather Fax lets you receive marine weather radiofascimile transmissions, using the audio from your HF marine radio. Just set it next to the radio's speaker or headphones, tune in a weather fax frequency, and watch the images come in.
Received fax images can be manually or automatically saved, and viewed later. You can also export them to your computer using iTunes.
There is also a built in copy of the NOAA/NWS Radiofacsimile schedule, and an option to download the latest copy of the schedule from the NWS website.
Full details here:
https://itunes.apple.com/us/app/hf-weather-fax/id394199597?ls=1&mt=8