If you don't know Golden Cheetah yet, https://goldencheetah.org/ https://goldencheetah.org/ All the Garmin Edge devices can be used without connecting them to

If you don't know Golden Cheetah yet, https://goldencheetah.org/ https://goldencheetah.org/ All the Garmin Edge devices can be used without connecting them to the internet, the data is available as USB mass storage.