:satellite::watch: Update expired Extended Prediction Orbit (EPO) GPS data for Garmin devices, e.g. Forerunner watches. Spend less time waiting for a GPS fix before a run or cycle *without* Garmin's software!
Retrieve EPO.BIN GPS data from Garmin’s servers on any platform that you
can compile a Go binary for, rather than only those that support Garmin
Connect. Since Garmin’s software doesn’t run natively on Linux, it’s
useful there.
EPO.BIN is GPS Extended Prediction Orbit (EPO) satellite data valid for
7 days, used to help speed up GPS locking on Garmin devices that support
this.
For Forerunner devices, the file should be copied toGARMIN/REMOTESW/EPO.BIN on the watch.
There are other existing options, e.g. running curl and then a short
Ruby script as detailed in this blog
post, or
using postrunner, a more
complete application which also uses Ruby. However, this code can be
compiled into a standalone binary, for different platforms, and then run
without any dependencies.
This repository hosts a daily
download of EPO.BIN.
If you don’t want to build from source, Linux and Windows
binaries are built
from tagged versions via GitHub Actions.
With Go installed:
go build or go installOr, use the Dockerfile via make:
make build-linux (for a Linux build)make build-windows (for a Windows build)Just run the compiled binary. EPO.BIN should be generated
in the same directory.
Code uses the POST data and idea from the blog post
here and
is also based on the GPL v2 licensed code in
postrunner, specificallyEPO_Downloader.rb. Go code is my contribution.