I wanted to move from OysterX to another location tracking app, but there was no way to export the data from OysterX in a standard format.

There are two SQLite database files that OysterX uses - OXDB_user and OXDB_world, I'm pretty sure OXDB_world is the one with the high resolution data, but I haven't figured out how to interpret it. What I did find was a nice list of coordinates in the OXStory table in the OXDB_user database. It's a pretty low quality version of the data, but it's good enough for my needs so that's what I used.

I've made a tool to extract a .gpx file from the OysterX OXDB_user file, which you can use here: OysterX to GPX Converter (everything is calculated locally, don't worry. I'm not harvesting your location history)

The ASUS Zenfone 4 has an FM decoder but didn't seem to have a radio app by default and all of the apps in the Play store were for internet radio, not FM radio.

As it turns out, there was actually a radio app already installed on the device, it's just hidden in the notification drawer and doesn't show up on the list of apps. Here's what I did to get an icon for the app, this requires Nova Launcher:

1. Long press on the homescreen and tap Widgets
2. Drag the Nova Launcher Activities widget to wherever you want the icon.
3. In the list of actvities that appears, select FM Radio _.FMRadioUIv3