You can still read and parse FIT files via many many utilities and services.
The problem that happened last time is the satellite shortcut files for GPS were never updated for weeks and went stale, so GPS took minutes to lock instead of seconds.
However it is well known now after years how to create the GPS files for mediatek chipsets.
What's never been documented is how to make them for the SONY GPS chipsets.
EPO.bin (mediatek) vs CPE.bin (sony)
this paper lists other potential sources for those files
aha! this is the url for direct download of CPE.bin which you should put into the \GARMIN\REMOTESW directory on your garmin watch/device that has SONY GPS (not mediatek)
#(save as CPE.bin into \GARMIN\REMOTESW )
# https://api.gcs.garmin.com/ephemeris/cpe/sony/lle?coverage=WEEKS_1&constellations=GPS,GLONASS,GALILEO,QZSS
The problem that happened last time is the satellite shortcut files for GPS were never updated for weeks and went stale, so GPS took minutes to lock instead of seconds.
However it is well known now after years how to create the GPS files for mediatek chipsets.
What's never been documented is how to make them for the SONY GPS chipsets.
EPO.bin (mediatek) vs CPE.bin (sony)
this paper lists other potential sources for those files
https://fruct.org/publications/volume-29/fruct29/files/Vin.p...
ADDING:
aha! this is the url for direct download of CPE.bin which you should put into the \GARMIN\REMOTESW directory on your garmin watch/device that has SONY GPS (not mediatek)