I did not know that. That is awesome. Thanks for the tip. I've got everything I need to do that too. I'll post some results here when I have a chance to give it a go!
I've stumbled across those transmissions before but didn't bother looking up what they were.
You might know about this already but it's weather related so I'll post it here. You can use a shortwave radio and some software to download weather charts over RadioFax:
http://www.blackcatsystems.com/software/multimode/fax.html
https://www.youtube.com/watch?v=D_VcK1283Y0
Not sure how much it's still used in the age of satellite internet but it's for ships to get charts when they're in the middle of the ocean.