Sony GPS Ephemeris Data Download Tool
This is a simple tool to download the latest GPS Ephemeris data (GPS prediction or assistme file) onto a Sony Cyber-shot camera (tested on the Sony DSC HX90V) on a Mac computer.
Download a compiled binary from the releases page or install and build:
go get github.com/diarmuidie/assistme go install
Run the script passing in the mount location of the SD card or camera (in this example the SD card is called
Untitled and is mounted in the
/Volumes folder, where MacOS mounts SD cards by default):