Despite the poor reviews for the Navtex app from Black Cat, I can confirm that it does work well with audio coupling if you have a decent receiver and set it up right. It helped me when my Nasa machine died due to a leaking memory battery.
Tru Spyglass. Being an old geezer, I had to have my Marine son teach me how to use this app. It's cool. I like to be able to set my location and find the boat launch again in the fog.