Hi, I bought the flipper zero probably because of the same reasons most of you bought it.
To play around and learn stuff while doing so.
Sadly I have no programmsing skills what so ever but I have an Idea that maybe someone skilled could realize.
There is such thing as Navtex which is basically a Fax messaging system for Ship, you get notifications and weather information from it.
The Frequency is inside of the capabilities of the Flipper, the same holds for Weatherfax and AIS(basically a positioning information system for ships) AIS should be only RX because TX would be illegal without a proper MMSI and also the Flipper has no GPS (as far as I know)
Weatherfax should be difficult as well because you can’s get the resolution on the screen that you need but you could use it to give the audio version ouf of it and maybe save the audiofile you received.
Then you could replay the audiofile to your smartphone with a proper app for visualization.
Maybe nobody is interested in my Idea, maybe it’s too difficult to make.
Happy new Year by the way!
I would be interested a lot as well. Would even contribute with donations, espacially a weatherfax reciever would be a killer feature 
Interesting ideas.
pushing this back to the top of the page.
I think you are mistaken about some of the frequencies used. Weatherfax and Navtex aren’t in the frequency range of the Flipper. I’m not sure what AIS would do for you. It won’t give you your position. The Flipper also would not have the accuracy to triangulate your position.
If you have other information directly link the source. There are other problems as well outside of the frequencies used.
Flipper Zero uses CC1101 radio chip which have frequency range of 300 MHz to 928 MHz or 300 MHz to 960 MHz.
AIS works on 2 channels 161.975 MHz 162.025 MHz GFSK
NEVTEX works on 518 kHz
Both of them is outside FQ range of CC1101
For AIS may be with external SX1262 LoRa chip, but i am not sure about the modulation supported by SX
i think GFSK can be received with radio designed for FSK, but i don’t know how will be managed BER correction.